Active Project Participants filtered by active Project number

Has anyone been able to use active project participants as an attribute in a PW Environment?

What we are trying to do is get a list of the active project participants, which are prefixed with the active project number and then pass that as an attribute.

The screenshot below shows the active Project participants, along with other user lists.

We can use the statement select o_name from dms_ulst but that returns all active user lists and we just want the current project.

Anyone have any ideas?

Thanks in advance 

Mahesh