diff --git a/api/schemas.yaml b/api/schemas.yaml
index e76cfb0..c4814b7 100644
--- a/api/schemas.yaml
+++ b/api/schemas.yaml
@@ -165,14 +165,6 @@ Template:
               min: 0
               max: 2
 
-ConditionTemplate:
-  allOf:
-    - $ref: 'api.yaml#/components/schemas/Template'
-  properties:
-    number_prefix:
-      type: string
-      example: B
-
 Email:
   properties:
     email:
diff --git a/api/template.yaml b/api/template.yaml
index 71a282f..4fa938d 100644
--- a/api/template.yaml
+++ b/api/template.yaml
@@ -14,7 +14,7 @@
             schema:
               type: array
               items:
-                $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+                $ref: 'api.yaml#/components/schemas/Template'
       401:
         $ref: 'api.yaml#/components/responses/401'
       500:
@@ -36,7 +36,7 @@
         content:
           application/json:
             schema:
-              $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+              $ref: 'api.yaml#/components/schemas/Template'
       401:
         $ref: 'api.yaml#/components/responses/401'
       404:
@@ -56,14 +56,14 @@
       content:
         application/json:
           schema:
-            $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+            $ref: 'api.yaml#/components/schemas/Template'
     responses:
       200:
         description: condition details
         content:
           application/json:
             schema:
-              $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+              $ref: 'api.yaml#/components/schemas/Template'
       400:
         $ref: 'api.yaml#/components/responses/400'
       401:
@@ -88,14 +88,14 @@
       content:
         application/json:
           schema:
-            $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+            $ref: 'api.yaml#/components/schemas/Template'
     responses:
       200:
         description: condition details
         content:
           application/json:
             schema:
-              $ref: 'api.yaml#/components/schemas/ConditionTemplate'
+              $ref: 'api.yaml#/components/schemas/Template'
       400:
         $ref: 'api.yaml#/components/responses/400'
       401:
diff --git a/src/models/condition_template.ts b/src/models/condition_template.ts
index 20c7234..62bf621 100644
--- a/src/models/condition_template.ts
+++ b/src/models/condition_template.ts
@@ -1,6 +1,7 @@
 import mongoose from 'mongoose';
 
 const ConditionTemplateSchema = new mongoose.Schema({
+  first_id: mongoose.Schema.Types.ObjectId,
   name: String,
   version: Number,
   parameters: [{
diff --git a/src/models/measurement_template.ts b/src/models/measurement_template.ts
index 080f42b..af14fee 100644
--- a/src/models/measurement_template.ts
+++ b/src/models/measurement_template.ts
@@ -1,6 +1,7 @@
 import mongoose from 'mongoose';
 
 const MeasurementTemplateSchema = new mongoose.Schema({
+  first_id: mongoose.Schema.Types.ObjectId,
   name: String,
   version: Number,
   parameters: [{
diff --git a/src/routes/template.spec.ts b/src/routes/template.spec.ts
index 95141af..e69b480 100644
--- a/src/routes/template.spec.ts
+++ b/src/routes/template.spec.ts
@@ -133,7 +133,8 @@ describe('/template', () => {
             if (err) return done(err);
             TemplateConditionModel.findById(res.body._id).lean().exec((err, data:any) => {
               if (err) return done(err);
-              should(data).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+              should(data).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+              should(data.first_id.toString()).be.eql('200000000000000000000001');
               should(data).have.property('name', 'heat aging');
               should(data).have.property('version', 2);
               should(data).have.property('parameters').have.lengthOf(1);
@@ -155,7 +156,8 @@ describe('/template', () => {
           if (err) return done(err);
           TemplateConditionModel.findById(res.body._id).lean().exec((err, data:any) => {
             if (err) return done(err);
-            should(data).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+            should(data).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+            should(data.first_id.toString()).be.eql('200000000000000000000001');
             should(data).have.property('name', 'heat aging');
             should(data).have.property('version', 2);
             should(data).have.property('parameters').have.lengthOf(2);
@@ -315,7 +317,8 @@ describe('/template', () => {
           if (err) return done(err);
           TemplateConditionModel.findById(res.body._id).lean().exec((err, data:any) => {
             if (err) return done(err);
-            should(data).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+            should(data).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+            should(data.first_id.toString()).be.eql(data._id.toString());
             should(data).have.property('name', 'heat aging');
             should(data).have.property('version', 1);
             should(data).have.property('parameters').have.lengthOf(1);
@@ -556,7 +559,8 @@ describe('/template', () => {
           should(_.omit(res.body, '_id')).be.eql({name: 'IR spectrum', version: 2, parameters: [{name: 'data point table', range: {min: 0, max: 1000}}]});
           TemplateMeasurementModel.findById(res.body._id).lean().exec((err, data:any) => {
             if (err) return done(err);
-            should(data).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+            should(data).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+            should(data.first_id.toString()).be.eql('300000000000000000000001');
             should(data).have.property('name', 'IR spectrum');
             should(data).have.property('version', 2);
             should(data).have.property('parameters').have.lengthOf(1);
@@ -580,7 +584,8 @@ describe('/template', () => {
           should(_.omit(res.body, '_id')).be.eql({name: 'IR spectrum', version: 2, parameters: [{name: 'dpt', range: {type: 'array'}}]});
           TemplateMeasurementModel.findById(res.body._id).lean().exec((err, data:any) => {
             if (err) return done(err);
-            should(data).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+            should(data).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+            should(data.first_id.toString()).be.eql('300000000000000000000001');
             should(data).have.property('name', 'IR spectrum');
             should(data).have.property('version', 2);
             should(data).have.property('parameters').have.lengthOf(1);
@@ -731,7 +736,8 @@ describe('/template', () => {
           TemplateMeasurementModel.find({name: 'vz'}).lean().exec((err, data:any) => {
             if (err) return done(err);
             should(data).have.lengthOf(1);
-            should(data[0]).have.only.keys('_id', 'name', 'version', 'parameters', '__v');
+            should(data[0]).have.only.keys('_id', 'first_id', 'name', 'version', 'parameters', '__v');
+            should(data[0].first_id.toString()).be.eql(data[0]._id.toString());
             should(data[0]).have.property('name', 'vz');
             should(data[0]).have.property('version', 1);
             should(data[0]).have.property('parameters').have.lengthOf(1);
diff --git a/src/routes/template.ts b/src/routes/template.ts
index 849cf59..2873946 100644
--- a/src/routes/template.ts
+++ b/src/routes/template.ts
@@ -6,6 +6,7 @@ import ConditionTemplateModel from '../models/condition_template';
 import MeasurementTemplateModel from '../models/measurement_template';
 import res400 from './validate/res400';
 import IdValidate from './validate/id';
+import mongoose from "mongoose";
 
 
 
@@ -65,6 +66,8 @@ router.post('/template/:collection(measurement|condition)/new', async (req, res,
   const {error, value: template} = TemplateValidate.input(req.body, 'new');
   if (error) return res400(error, res);
 
+  template._id = mongoose.Types.ObjectId();  // set reference to itself for first version of template
+  template.first_id = template._id;
   template.version = 1;  // set template version
   await new (model(req))(template).save((err, data) => {
     if (err) next (err);
diff --git a/src/test/db.json b/src/test/db.json
index 0d49876..4ef811c 100644
--- a/src/test/db.json
+++ b/src/test/db.json
@@ -423,6 +423,7 @@
     "condition_templates": [
       {
         "_id": {"$oid":"200000000000000000000001"},
+        "first_id": {"$oid":"200000000000000000000001"},
         "name": "heat treatment",
         "version": 1,
         "parameters": [
@@ -447,6 +448,7 @@
       },
       {
         "_id": {"$oid":"200000000000000000000002"},
+        "first_id": {"$oid":"200000000000000000000001"},
         "name": "heat treatment 2",
         "version": 2,
         "parameters": [
@@ -459,6 +461,7 @@
       },
       {
         "_id": {"$oid":"200000000000000000000003"},
+        "first_id": {"$oid":"200000000000000000000003"},
         "name": "raw material",
         "version": 1,
         "parameters": [
@@ -469,6 +472,7 @@
     "measurement_templates": [
       {
         "_id": {"$oid":"300000000000000000000001"},
+        "first_id": {"$oid":"300000000000000000000001"},
         "name": "spectrum",
         "version": 1,
         "parameters": [
@@ -483,6 +487,7 @@
       },
       {
         "_id": {"$oid":"300000000000000000000002"},
+        "first_id": {"$oid":"300000000000000000000001"},
         "name": "kf",
         "version": 2,
         "parameters": [
@@ -505,6 +510,7 @@
       },
       {
         "_id": {"$oid":"300000000000000000000003"},
+        "first_id": {"$oid":"300000000000000000000003"},
         "name": "mt 3",
         "version": 1,
         "parameters": [