OUD Proxy: search against secondary participant of a join workflow

Is it possible to perform a search on  a OUD Join workflow using the attributes of secondary participant.

Version : 11.1.2.3.0

primary participant: OUD1

secondary participant: OUD2

Join type : one-to-one

join Condition: OUD1.uid=OUD2.uid

Eg:

OUD1 attrs: uid, cn,sn,location

OUD2 attrs : uid, employeeid

Is it possible to search against the join as (employeeid=*)

When I run this using ldapsearch I get zero results. And below statements from Admin guide states that Search operation is performed on primarty participant only. Is my understnading correct?

Statement from admin guide: "Processed in primary participant first.Then,joins the entry with all eligible secondary participants for each entry returned from the primary that satisfies the Join condition."