diff --git a/api/sample.yaml b/api/sample.yaml
index d074172..eae0ddc 100644
--- a/api/sample.yaml
+++ b/api/sample.yaml
@@ -170,7 +170,7 @@
 /sample/new:
   post:
     summary: add sample
-    description: 'Auth: basic, levels: write, maintain, dev, admin'
+    description: 'Auth: basic, levels: write, maintain, dev, admin.   Number property is only for admin when adding existing samples'
     x-doc: 'Adds status: 0 automatically'
     tags:
       - /sample
@@ -181,7 +181,12 @@
       content:
         application/json:
           schema:
-            $ref: 'api.yaml#/components/schemas/Sample'
+            allOf:
+              - $ref: 'api.yaml#/components/schemas/Sample'
+            properties:
+              number:
+                type: string
+                readOnly: false
     responses:
       200:
         description: samples details
diff --git a/api/schemas.yaml b/api/schemas.yaml
index c4814b7..21ceddf 100644
--- a/api/schemas.yaml
+++ b/api/schemas.yaml
@@ -69,6 +69,7 @@ Sample:
               relation:
                 type: string
                 example: part to this sample
+
 SampleDetail:
   allOf:
     - $ref: 'api.yaml#/components/schemas/_Id'
diff --git a/src/index.ts b/src/index.ts
index 7dda199..3776c34 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,14 +7,12 @@ import db from './db';
 
 // TODO: changelog
 // TODO: check executing index.js/move everything needed into dist
-// TODO: One condition per sample
 // TODO: validation: VZ, Humidity: min/max value, DPT: filename
-// TODO: condition values not needed on initial add
-// TODO: add multiple samples at once
-// TODO: coverage
+// TODO: add multiple samples at once (only GUI)
 // TODO: think about the display of deleted/new samples and validation in data and UI
 // TODO: improve error coverage
 // TODO: guess properties from material name in UI
+// TODO: mongodb user
 
 // tell if server is running in debug or production environment
 console.info(process.env.NODE_ENV === 'production' ? '===== PRODUCTION =====' : process.env.NODE_ENV === 'test' ? '' :'===== DEVELOPMENT =====');
diff --git a/src/routes/measurement.spec.ts b/src/routes/measurement.spec.ts
index 8bef49b..25cc5e9 100644
--- a/src/routes/measurement.spec.ts
+++ b/src/routes/measurement.spec.ts
@@ -586,14 +586,24 @@ describe('/measurement', () => {
         done();
       });
     });
+    it('rejects no values', done => {
+      TestHelper.request(server, done, {
+        method: 'post',
+        url: '/measurement/new',
+        auth: {basic: 'janedoe'},
+        httpStatus: 400,
+        req: {sample_id: '400000000000000000000001', values: {}, measurement_template: '300000000000000000000002'},
+        res: {status: 'At least one value is required'}
+      });
+    });
     it('rejects a value not in the value range', done => {
       TestHelper.request(server, done, {
         method: 'post',
         url: '/measurement/new',
         auth: {basic: 'janedoe'},
         httpStatus: 400,
-        req: {sample_id: '400000000000000000000001', values: {val1: 4}, measurement_template: '300000000000000000000003'},
-        res: {status: 'Invalid body format', details: '"val1" must be one of [1, 2, 3, null]'}
+        req: {sample_id: '400000000000000000000001', values: {val2: 5}, measurement_template: '300000000000000000000004'},
+        res: {status: 'Invalid body format', details: '"val2" must be one of [1, 2, 3, 4, null]'}
       });
     });
     it('rejects a value below minimum range', done => {
@@ -664,6 +674,16 @@ describe('/measurement', () => {
         done();
       });
     });
+    it('rejects an old version of a measurement template', done => {
+      TestHelper.request(server, done, {
+        method: 'post',
+        url: '/measurement/new',
+        auth: {basic: 'janedoe'},
+        httpStatus: 400,
+        req: {sample_id: '400000000000000000000001', values: {val1: 2}, measurement_template: '300000000000000000000003'},
+        res: {status: 'Old template version not allowed'}
+      });
+    });
     it('rejects an API key', done => {
       TestHelper.request(server, done, {
         method: 'post',
diff --git a/src/routes/measurement.ts b/src/routes/measurement.ts
index 2b94060..a1b3a94 100644
--- a/src/routes/measurement.ts
+++ b/src/routes/measurement.ts
@@ -130,6 +130,14 @@ async function templateCheck (measurement, param, res, next) {  // validate meas
 
   // fill not given values for new measurements
   if (param === 'new') {
+    // get all template versions and check if given is latest
+    const templateVersions = await MeasurementTemplateModel.find({first_id: templateData.first_id}).sort({version: -1}).lean().exec().catch(err => next(err)) as any;
+    if (templateVersions instanceof Error) return false;
+    if (measurement.measurement_template !== templateVersions[0]._id.toString()) {  // template not latest
+      res.status(400).json({status: 'Old template version not allowed'});
+      return false;
+    }
+
     if (Object.keys(measurement.values).length === 0) {
       res.status(400).json({status: 'At least one value is required'});
       return false
diff --git a/src/routes/sample.spec.ts b/src/routes/sample.spec.ts
index f2fdd36..baa46fe 100644
--- a/src/routes/sample.spec.ts
+++ b/src/routes/sample.spec.ts
@@ -454,6 +454,16 @@ describe('/sample', () => {
         res: {status: 'Color not available for material'}
       });
     });
+    it('rejects an undefined color for the same material', done => {
+      TestHelper.request(server, done, {
+        method: 'put',
+        url: '/sample/400000000000000000000001',
+        auth: {basic: 'janedoe'},
+        httpStatus: 400,
+        req: {type: 'part', color: 'signalviolet', batch: '114531', notes: {comment: 'Testcomment', sample_references: [{sample_id: '400000000000000000000003', relation: 'part to this sample'}]}},
+        res: {status: 'Color not available for material'}
+      });
+    });
     it('rejects an unknown material id', done => {
       TestHelper.request(server, done, {
         method: 'put',
@@ -573,6 +583,26 @@ describe('/sample', () => {
         res: {_id: '400000000000000000000006', number: 'Rng36', type: 'granulate', color: 'black', batch: '', condition: {}, material_id: '100000000000000000000004', note_id: null, user_id: '000000000000000000000002'}
       });
     });
+    it('rejects an old version of a condition template', done => {
+      TestHelper.request(server, done, {
+        method: 'put',
+        url: '/sample/400000000000000000000001',
+        auth: {basic: 'janedoe'},
+        httpStatus: 400,
+        req: {condition: {p1: 36, condition_template: '200000000000000000000004'}},
+        res: {status: 'Old template version not allowed'}
+      });
+    });
+    it('allows keeping an old version of a condition template', done => {
+      TestHelper.request(server, done, {
+        method: 'put',
+        url: '/sample/400000000000000000000004',
+        auth: {basic: 'admin'},
+        httpStatus: 200,
+        req: {condition: {p1: 36, condition_template: '200000000000000000000004'}},
+        res: {_id: '400000000000000000000004', number: '32', type: 'granulate', color: 'black', batch: '1653000308', condition: {p1: 36, condition_template: '200000000000000000000004'}, material_id: '100000000000000000000005', note_id: '500000000000000000000003', user_id: '000000000000000000000003'}
+      });
+    });
     it('rejects an changing back to an empty condition', done => {
       TestHelper.request(server, done, {
         method: 'put',
@@ -1108,7 +1138,7 @@ describe('/sample', () => {
         res: {status: 'Material not available'}
       });
     });
-    it('rejects a sample number', done => {
+    it('rejects a sample number for a write user', done => {
       TestHelper.request(server, done, {
         method: 'post',
         url: '/sample/new',
@@ -1118,6 +1148,38 @@ describe('/sample', () => {
         res: {status: 'Invalid body format', details: '"number" is not allowed'}
       });
     });
+    it('allows a sample number for an admin user', done => {
+      TestHelper.request(server, done, {
+        method: 'post',
+        url: '/sample/new',
+        auth: {basic: 'admin'},
+        httpStatus: 200,
+        req: {number: 'Rng34', color: 'black', type: 'granulate', batch: '1560237365', material_id: '100000000000000000000001', notes: {comment: 'Testcomment', sample_references: [{sample_id: '400000000000000000000003', relation: 'part to this sample'}]}},
+      }).end((err, res) => {
+        if (err) return done (err);
+        should(res.body).have.only.keys('_id', 'number', 'color', 'type', 'batch', 'condition', 'material_id', 'note_id', 'user_id');
+        should(res.body).have.property('_id').be.type('string');
+        should(res.body).have.property('number', 'Rng34');
+        should(res.body).have.property('color', 'black');
+        should(res.body).have.property('type', 'granulate');
+        should(res.body).have.property('batch', '1560237365');
+        should(res.body).have.property('condition', {});
+        should(res.body).have.property('material_id', '100000000000000000000001');
+        should(res.body).have.property('note_id').be.type('string');
+        should(res.body).have.property('user_id', '000000000000000000000003');
+        done();
+      });
+    });
+    it('rejects an existing sample number for an admin user', done => {
+      TestHelper.request(server, done, {
+        method: 'post',
+        url: '/sample/new',
+        auth: {basic: 'admin'},
+        httpStatus: 400,
+        req: {number: 'Rng33', color: 'black', type: 'granulate', batch: '1560237365', material_id: '100000000000000000000001', notes: {comment: 'Testcomment', sample_references: [{sample_id: '400000000000000000000003', relation: 'part to this sample'}]}},
+        res: {status: 'Sample number already taken'}
+      });
+    });
     it('rejects an invalid sample reference', done => {
       TestHelper.request(server, done, {
         method: 'post',
@@ -1208,6 +1270,16 @@ describe('/sample', () => {
         res: {status: 'Condition template not available'}
       });
     });
+    it('rejects an old version of a condition template', done => {
+      TestHelper.request(server, done, {
+        method: 'post',
+        url: '/sample/new',
+        auth: {basic: 'janedoe'},
+        httpStatus: 400,
+        req: {color: 'black', type: 'granulate', batch: '1560237365', condition: {p1: 36, condition_template: '200000000000000000000004'}, material_id: '100000000000000000000001', notes: {comment: 'Testcomment', sample_references: [{sample_id: '400000000000000000000003', relation: 'part to this sample'}]}},
+        res: {status: 'Old template version not allowed'}
+      });
+    });
     it('rejects a missing color', done => {
       TestHelper.request(server, done, {
         method: 'post',
diff --git a/src/routes/sample.ts b/src/routes/sample.ts
index e741c4a..15d2a62 100644
--- a/src/routes/sample.ts
+++ b/src/routes/sample.ts
@@ -90,7 +90,7 @@ router.put('/sample/' + IdValidate.parameter(), (req, res, next) => {
     }
 
     if (sample.hasOwnProperty('condition') && !(_.isEmpty(sample.condition) && _.isEmpty(sampleData.condition))) {  // do not execute check if condition is and was empty
-      if (!await conditionCheck(sample.condition, 'change', res, next)) return;
+      if (!await conditionCheck(sample.condition, 'change', res, next, sampleData.condition.condition_template.toString() !== sample.condition.condition_template)) return;
     }
 
     if (sample.hasOwnProperty('notes')) {
@@ -217,7 +217,7 @@ router.post('/sample/new', async (req, res, next) => {
     req.body.condition = {};
   }
 
-  const {error, value: sample} = SampleValidate.input(req.body, 'new');
+  const {error, value: sample} = SampleValidate.input(req.body, 'new' + (req.authDetails.level === 'admin' ? '-admin' : ''));
   if (error) return res400(error, res);
 
   if (!await materialCheck(sample, res, next)) return;
@@ -232,7 +232,12 @@ router.post('/sample/new', async (req, res, next) => {
   }
 
   sample.status = globals.status.new;  // set status to new
-  sample.number = await numberGenerate(sample, req, res, next);
+  if (sample.hasOwnProperty('number')) {
+    if (!await numberCheck(sample, res, next)) return;
+  }
+  else {
+    sample.number = await numberGenerate(sample, req, res, next);
+  }
   if (!sample.number) return;
 
   await new NoteModel(sample.notes).save((err, data) => {  // save notes
@@ -272,6 +277,15 @@ async function numberGenerate (sample, req, res, next) {  // generate number in
   return req.authDetails.location + (sampleData ? Number(sampleData.number.replace(/[^0-9]+/g, '')) + 1 : 1);
 }
 
+async function numberCheck(sample, res, next) {
+  const sampleData = await SampleModel.findOne({number: sample.number}).lean().exec().catch(err => {next(err); return false;});
+  if (sampleData) {  // found entry with sample number
+    res.status(400).json({status: 'Sample number already taken'});
+    return false
+  }
+  return true;
+}
+
 async function materialCheck (sample, res, next, id = sample.material_id) {  // validate material_id and color, returns false if invalid
   const materialData = await MaterialModel.findById(id).lean().exec().catch(err => next(err)) as any;
   if (materialData instanceof Error) return false;
@@ -286,7 +300,7 @@ async function materialCheck (sample, res, next, id = sample.material_id) {  //
   return true;
 }
 
-async function conditionCheck (condition, param, res, next) {  // validate treatment template, returns false if invalid, otherwise template data
+async function conditionCheck (condition, param, res, next, checkVersion = true) {  // validate treatment template, returns false if invalid, otherwise template data
   if (!condition.condition_template || !IdValidate.valid(condition.condition_template)) {  // template id not found
     res.status(400).json({status: 'Condition template not available'});
     return false;
@@ -298,6 +312,16 @@ async function conditionCheck (condition, param, res, next) {  // validate treat
     return false;
   }
 
+  if (checkVersion) {
+    // get all template versions and check if given is latest
+    const conditionVersions = await ConditionTemplateModel.find({first_id: conditionData.first_id}).sort({version: -1}).lean().exec().catch(err => next(err)) as any;
+    if (conditionVersions instanceof Error) return false;
+    if (condition.condition_template !== conditionVersions[0]._id.toString()) {  // template not latest
+      res.status(400).json({status: 'Old template version not allowed'});
+      return false;
+    }
+  }
+
   // validate parameters
   const {error, value: ignore} = ParametersValidate.input(_.omit(condition, 'condition_template'), conditionData.parameters, param);
   if (error) {res400(error, res); return false;}
diff --git a/src/routes/template.spec.ts b/src/routes/template.spec.ts
index e69b480..cbc481a 100644
--- a/src/routes/template.spec.ts
+++ b/src/routes/template.spec.ts
@@ -4,7 +4,6 @@ import TemplateConditionModel from '../models/condition_template';
 import TemplateMeasurementModel from '../models/measurement_template';
 import TestHelper from "../test/helper";
 
-// TODO: do not allow usage of old templates for new samples
 
 describe('/template', () => {
   let server;
@@ -644,7 +643,7 @@ describe('/template', () => {
           req: {parameters: [{name: 'weight %', range: {}}]}
         }).end((err, res) => {
           if (err) return done(err);
-          should(_.omit(res.body, '_id')).be.eql({name: 'kf', version: 3, parameters: [{name: 'weight %', range: {}}]});
+          should(_.omit(res.body, '_id')).be.eql({name: 'kf', version: 2, parameters: [{name: 'weight %', range: {}}]});
           done();
         });
       });
diff --git a/src/routes/validate/sample.ts b/src/routes/validate/sample.ts
index 93b86b1..9cb8cbb 100644
--- a/src/routes/validate/sample.ts
+++ b/src/routes/validate/sample.ts
@@ -67,6 +67,17 @@ export default class SampleValidate {
         notes: this.sample.notes,
       }).validate(data);
     }
+    else if (param === 'new-admin') {
+      return Joi.object({
+        number: this.sample.number.required(),
+        color: this.sample.color.required(),
+        type: this.sample.type.required(),
+        batch: this.sample.batch.required(),
+        condition: this.sample.condition.required(),
+        material_id: IdValidate.get().required(),
+        notes: this.sample.notes.required()
+      }).validate(data);
+    }
     else {
       return{error: 'No parameter specified!', value: {}};
     }
diff --git a/src/test/db.json b/src/test/db.json
index 4ef811c..ea2dd10 100644
--- a/src/test/db.json
+++ b/src/test/db.json
@@ -59,9 +59,8 @@
         "color": "black",
         "batch": "1653000308",
         "condition": {
-          "material": "hot air",
-          "weeks": 5,
-          "condition_template": {"$oid":"200000000000000000000001"}
+          "p1": 44,
+          "condition_template": {"$oid":"200000000000000000000004"}
         },
         "material_id": {"$oid":"100000000000000000000005"},
         "note_id": {"$oid":"500000000000000000000003"},
@@ -447,24 +446,37 @@
         "__v": 0
       },
       {
-        "_id": {"$oid":"200000000000000000000002"},
-        "first_id": {"$oid":"200000000000000000000001"},
-        "name": "heat treatment 2",
-        "version": 2,
+        "_id": {"$oid":"200000000000000000000003"},
+        "first_id": {"$oid":"200000000000000000000003"},
+        "name": "raw material",
+        "version": 1,
+        "parameters": [
+        ],
+        "__v": 0
+      },
+      {
+        "_id": {"$oid":"200000000000000000000004"},
+        "first_id": {"$oid":"200000000000000000000004"},
+        "name": "old condition",
+        "version": 1,
         "parameters": [
           {
-            "name": "material",
+            "name": "p1",
             "range": {}
           }
         ],
         "__v": 0
       },
       {
-        "_id": {"$oid":"200000000000000000000003"},
-        "first_id": {"$oid":"200000000000000000000003"},
-        "name": "raw material",
-        "version": 1,
+        "_id": {"$oid":"200000000000000000000005"},
+        "first_id": {"$oid":"200000000000000000000004"},
+        "name": "new condition",
+        "version": 2,
         "parameters": [
+          {
+            "name": "p11",
+            "range": {}
+          }
         ],
         "__v": 0
       }
@@ -487,9 +499,9 @@
       },
       {
         "_id": {"$oid":"300000000000000000000002"},
-        "first_id": {"$oid":"300000000000000000000001"},
+        "first_id": {"$oid":"300000000000000000000002"},
         "name": "kf",
-        "version": 2,
+        "version": 1,
         "parameters": [
           {
             "name": "weight %",
@@ -522,6 +534,21 @@
           }
         ],
         "__v": 0
+      },
+      {
+        "_id": {"$oid":"300000000000000000000004"},
+        "first_id": {"$oid":"300000000000000000000003"},
+        "name": "mt 31",
+        "version": 2,
+        "parameters": [
+          {
+            "name": "val2",
+            "range": {
+              "values": [1,2,3,4]
+            }
+          }
+        ],
+        "__v": 0
       }
     ],
     "users": [