diff --git a/packages/concerto-core/src/introspect/classdeclaration.ts b/packages/concerto-core/src/introspect/classdeclaration.ts
index e86fba57a9..d925a54a32 100644
--- a/packages/concerto-core/src/introspect/classdeclaration.ts
+++ b/packages/concerto-core/src/introspect/classdeclaration.ts
@@ -249,6 +249,10 @@ class ClassDeclaration extends Declaration {
                     throw new IllegalModelException('Identifying fields cannot be optional.', this.modelFile, this.ast.location);
                 }
 
+                if (idField.isArray()) {
+                    throw new IllegalModelException('Identifying fields cannot be arrays.', this.modelFile, this.ast.location);
+                }
+
                 if(this.superType) {
                     const superType = this.getModelFile().getType(this.superType);
                     if (superType && superType.isIdentified() ) {
diff --git a/packages/concerto-core/test/data/parser/assetdeclaration.arrayid.cto b/packages/concerto-core/test/data/parser/assetdeclaration.arrayid.cto
new file mode 100644
index 0000000000..fcbb9495cd
--- /dev/null
+++ b/packages/concerto-core/test/data/parser/assetdeclaration.arrayid.cto
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace com.hyperledger.testing@1.0.0
+
+import com.hyperledger.elsewhere@1.0.0.BaseAsset
+
+asset TestAsset identified by assetId {
+    o String[] assetId
+}
diff --git a/packages/concerto-core/test/introspect/assetdeclaration.js b/packages/concerto-core/test/introspect/assetdeclaration.js
index 226d9ab6bf..c5dcbb85a5 100644
--- a/packages/concerto-core/test/introspect/assetdeclaration.js
+++ b/packages/concerto-core/test/introspect/assetdeclaration.js
@@ -98,6 +98,13 @@ describe('AssetDeclaration', () => {
             }).should.throw(/Identifying fields cannot be optional/);
         });
 
+        it('should throw when identifying field is an array', () => {
+            let asset = loadAssetDeclaration('test/data/parser/assetdeclaration.arrayid.cto');
+            (() => {
+                asset.validate();
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
+
         it('should throw when field has been duplicated in the same class', () => {
             let asset = loadAssetDeclaration('test/data/parser/assetdeclaration.dupesimp.cto');
 
diff --git a/packages/concerto-core/test/introspect/classdeclaration.js b/packages/concerto-core/test/introspect/classdeclaration.js
index 009cd4b841..2c549a435a 100644
--- a/packages/concerto-core/test/introspect/classdeclaration.js
+++ b/packages/concerto-core/test/introspect/classdeclaration.js
@@ -97,6 +97,73 @@ describe('ClassDeclaration', () => {
             const clazz = introspectUtils.loadLastDeclaration('test/data/parser/classdeclaration.scalararray.cto', ConceptDeclaration);
             clazz.validate();
         });
+
+        it('should throw when a string array is used as an identifier', () => {
+            const mm = new ModelManager();
+            (() => {
+                mm.addCTOModel(`
+namespace com.testing@1.0.0
+asset Person identified by names {
+    o String[] names
+}
+                `);
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
+
+        it('should throw when a scalar string array is used as an identifier', () => {
+            const mm = new ModelManager();
+            (() => {
+                mm.addCTOModel(`
+namespace com.testing@1.0.0
+scalar SSN extends String default="000-00-0000" regex=/\\d{3}-\\d{2}-\\d{4}/
+concept Person identified by ssnArray {
+    o SSN[] ssnArray
+}
+                `);
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
+
+        it('should throw when an inherited string array is used as an identifier', () => {
+            const mm = new ModelManager();
+            (() => {
+                mm.addCTOModel(`
+namespace com.testing@1.0.0
+abstract asset Base {
+    o String[] ids
+}
+asset Child identified by ids extends Base {
+}
+                `);
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
+
+        it('should throw when a participant is identified by an array', () => {
+            const mm = new ModelManager();
+            (() => {
+                mm.addCTOModel(`
+namespace com.testing@1.0.0
+participant Member identified by memberIds {
+    o String[] memberIds
+}
+                `);
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
+
+        it('should throw when a 3rd-level subclass is identified by an array defined in a root class', () => {
+            const mm = new ModelManager();
+            (() => {
+                mm.addCTOModel(`
+namespace com.testing@1.0.0
+abstract concept Root {
+    o String[] codes
+}
+abstract concept Middle extends Root {
+}
+asset Leaf identified by codes extends Middle {
+}
+                `);
+            }).should.throw(/Identifying fields cannot be arrays/);
+        });
     });
 
     describe('#accept', () => {