diff --git a/packages/concerto-core/lib/introspect/modelfile.js b/packages/concerto-core/lib/introspect/modelfile.js
index 561f42f24..a879331c9 100644
--- a/packages/concerto-core/lib/introspect/modelfile.js
+++ b/packages/concerto-core/lib/introspect/modelfile.js
@@ -219,7 +219,6 @@ class ModelFile extends Decorated {
      */
     validate() {
         super.validate();
-        // TODO
         // A dictionary of imports to versions to track unique namespaces
         const importsMap = new Map();
 
@@ -738,7 +737,6 @@ class ModelFile extends Decorated {
             );
         }
 
-        // TODO:handle ImportTypes
         this.imports = imports;
         this.imports.forEach((imp) => {
             this.enforceImportVersioning(imp);
@@ -752,8 +750,6 @@ class ModelFile extends Decorated {
                 break;
             case `${MetaModelNamespace}.ImportTypes`:
                 if (this.getModelManager().isAliasedTypeEnabled()) {
-                    // map: alias name to the fqn's
-                    // imp.types and imp.aliasedTypes both are available
                     const aliasedTypes = new Map();
                     if (imp.aliasedTypes) {
                         imp.aliasedTypes.forEach(({ name, aliasName }) => {
@@ -763,7 +759,18 @@ class ModelFile extends Decorated {
                             aliasedTypes.set(name, aliasName);
                         });
                     }
-                    imp.types.forEach((type)=> aliasedTypes.has(type)? this.importShortNames.set(aliasedTypes.get(type),`${imp.namespace}.${type}`):this.importShortNames.set(type,`${imp.namespace}.${type}`));
+                    // Local-name(aliased or non-aliased) is mapped to the Fully qualified type name
+                    imp.types.forEach((type) =>
+                        aliasedTypes.has(type)
+                            ? this.importShortNames.set(
+                                aliasedTypes.get(type),
+                                `${imp.namespace}.${type}`
+                            )
+                            : this.importShortNames.set(
+                                type,
+                                `${imp.namespace}.${type}`
+                            )
+                    );
                 } else {
                     if (imp.aliasedTypes) {
                         throw new Error('Aliasing disabled, set enableAliasType to true');
diff --git a/packages/concerto-core/test/introspect/modelfile.js b/packages/concerto-core/test/introspect/modelfile.js
index 598997da0..8c6208cb7 100644
--- a/packages/concerto-core/test/introspect/modelfile.js
+++ b/packages/concerto-core/test/introspect/modelfile.js
@@ -691,6 +691,29 @@ describe('ModelFile', () => {
             let modelFile2 = ParserUtil.newModelFile(modelManager, model2);
             (() => modelFile2.validate()).should.not.throw();
         });
+
+        it('should not throw if declaration is extended on a aliased type declaration', () => {
+            const model1 = `
+            namespace org.saluja
+            
+            scalar nickname extends String
+            asset Vehicle identified by serialno {
+                o String serialno
+            }`;
+            const model2 = `
+            namespace org.acme
+            import org.saluja.{Vehicle as V,nickname as nk}
+            
+            asset Car extends V{
+                o String company 
+                o nk shortname
+            }`;
+            modelManager.enableMapType = true;
+            let modelFile1 = ParserUtil.newModelFile(modelManager, model1);
+            modelManager.addModelFile(modelFile1);
+            let modelFile2 = ParserUtil.newModelFile(modelManager, model2);
+            (() => modelFile2.validate()).should.not.throw();
+        });
     });