Open issues for a user

Dear experts

Few users are needed to shift from one Organisation to other Organisation witing the EBP Organisation.

In this case, already few open PO's are there which are created by that user.

Changing the user from one org to other org will effect anything for open PO's? whether I need to close all the open PO's?

Is there any table available to see all the open PO's against a user?

Thanks in advance,

Regards,

Krish