Bug fixed in m_ivimStructure template

ttcn/IVIM/LibItsIvim_Templates.ttcn

@@ -281,7 +281,7 @@ module LibItsIvim_Templates {
                                                      in template (omit) IviStructure.optional_ p_optional_ := omit
         ) := {
             mandatory   := p_mandatory,
-            optional_   := omit
+            optional_   := p_optional_
         } // End of template m_ivimStructure
         
         /**