diff --git a/compiler2/ttcn3/AST_ttcn3.cc b/compiler2/ttcn3/AST_ttcn3.cc
index 8c86d4ac621bb8990f27c8582b51c7954b8b43eb..0bbdd64758e899e13a5bad27357cb42c70aad127 100644
--- a/compiler2/ttcn3/AST_ttcn3.cc
+++ b/compiler2/ttcn3/AST_ttcn3.cc
@@ -6809,11 +6809,19 @@ namespace Ttcn {
   
   bool Def_Function_Base::is_identical(Def_Function_Base* p_other)
   {
-    if (asstype != p_other->get_asstype()) {
-      return false;
+    Common::Assignment::asstype_t asstype2 = p_other->get_asstype();
+    if (asstype != asstype2) {
+      if ((asstype == Common::Assignment::A_FUNCTION && asstype2 != Common::Assignment::A_EXT_FUNCTION) ||
+          (asstype == Common::Assignment::A_EXT_FUNCTION && asstype2 != Common::Assignment::A_FUNCTION) ||
+          (asstype == Common::Assignment::A_FUNCTION_RVAL && asstype2 != Common::Assignment::A_EXT_FUNCTION_RVAL) ||
+          (asstype == Common::Assignment::A_EXT_FUNCTION_RVAL && asstype2 != Common::Assignment::A_FUNCTION_RVAL) ||
+          (asstype == Common::Assignment::A_FUNCTION_RTEMP && asstype2 != Common::Assignment::A_EXT_FUNCTION_RTEMP) ||
+          (asstype == Common::Assignment::A_EXT_FUNCTION_RTEMP && asstype2 != Common::Assignment::A_FUNCTION_RTEMP)) {
+        return false;
+      }
     }
-    else if (return_type != NULL &&
-             !p_other->return_type->is_identical(return_type)) {
+    if (return_type != NULL &&
+        !p_other->return_type->is_identical(return_type)) {
       return false;
     }
     FormalParList* other_fp_list = p_other->get_FormalParList();
diff --git a/function_test/Semantic_Analyser/oop/oop_SE.ttcn b/function_test/Semantic_Analyser/oop/oop_SE.ttcn
index d3494c3cfa26b2dd83b6f4d84d10245ed042265b..b5a49e641ad9697a8633d0b3d7b34accd6825637 100644
--- a/function_test/Semantic_Analyser/oop/oop_SE.ttcn
+++ b/function_test/Semantic_Analyser/oop/oop_SE.ttcn
@@ -482,6 +482,11 @@ type class C48 extends C47 { //^In type definition//
   function m4() { } //Cannot override final method `@oop_SE.C47.m4'//
 }
 
+type class C49 extends C40 {
+  function f1(in integer p) return octetstring { return int2oct(p, 2); }
+  function f2() { }
+}
+
 
 function f_of_operator() { //^In function definition//
   var C0 x := C0.create;