How do we know if the Update function module is executed?

Hi Experts,

I have a requirement of showing the corresponding purchase requisition number when we create the sales order. I have Created an Implicit enhancement at the end of the subroutine BELEG_SICHERN in the program SAPMV45A. This is the subroutine that shows the sales order number creation status message at the status bar. I am supposed to query the VBEP here to pull the Purchase Requisition No. However the problem is that the process of creating the Purchase requisition is an asynchronous process and it is done via an update function module ( ME_UPDATE_REQUISITION ). I am not always getting the corresponding purchase requisition number due to this. I have done a work around by adding a 1 sec delay. Just wanted to check if there is any other method to wait till the update function module is done with the PR creation so that I get the PR number always.

Thanks,

Ajith Cheruvally