Open Source Document Management System | OpenKM

Hello,
How can I use default database OKM_APP in workflow? When I tried OpenKM says "OKM_USER is not mapped [select $USR_ID from OKM_USER]".
Can you help me?

Suggest box only can working with metadata tables not with other tables.

For this case you should use normal list, and values should be listed on a variable ( var=some variable ) during workflow task execution, that's the idea.