SAP Knowledge Base Article - Public

3014243 - You receive the error message <Element name prefix EXT_ is reserved for extensibility> when activating a .ds file in Cloud Applications Studio


You face the following error when you activate a data source in Cloud Applications Studio

<Element name prefix EXT_ is reserved for extensibility>


  • SAP Business ByDesign
  • SAP Cloud for Customer
  • SAP Cloud Applications Studio

Reproducing the Issue

  1. You have one or several extended Element named begin with <EXT_> (eg. element EXT_FieldID :ID) added in a custom business object or an extension business object.
  2. Add these fields in a custom data source.
  3. Activate the data source and you receive the below errors. 



The prefix EXT_ is reserved for SAP internal storing and shouldn't be used during creation of elements.


This is the expected system behavior. Please remove the prefix EXT_ for your elements in.


Custom Data Source, Extension field, EXT_ , KBA , AP-RC-BDS-ANA , ByDesign Studio Analytics , Problem


SAP Business ByDesign all versions ; SAP Cloud Applications Studio all versions ; SAP Cloud for Customer add-ins all versions