PPM 6.1 SP09: Search doesn't return Documents on Object Links tab

Hello Everyone,

I am not able to search Documents on 'Object Links' tab in the project. Please see the attached error screenshot. '0Document' object type is active in the following SPRO configuration.

SAP Portfolio and Project Management -> Project Management -> Structure -> Define Object Types for Object Links.

Could you please tell me any other configuration I may need to do in order get the document search results and link them successfully in the PPM Project?.

Regards,

Mohan