Inter Project Billing - Not able to choose Project outside the Operating unit.

Provider Project A in Operating Unit A

Receiver Project B in Operating Unit B

1) Project A has customer as same Intercompany customer mentioned in Internal Billing option in implementation options in both Operating Units A and B.

2) In Operating Unit B, i have a project B for which i have marked the task as Inter Project Invoice Receiving Task. Project B is with Status as Open for new transactions.

3) In the Receiver Operating Unit, i have added the Provider Receiver controls to have the Operating Unit A with right legal entity.

4) In Project A - Customer and Contact Form - I am trying to choose the Project B with the task number. Those projects which are within Operating uniit B are showing up not the one in Operating unit A.