ME22n - table where PO initially displayed on screen load is stored?

Hello,

Does anyone know where the PO that is displayed when a user goes directly to ME22n is stored? I know this is the last PO they were working with.

I am trying to initialize the screen so, if they do not have access to change the po(Based on a custom Auth object) they would see a blank screen. (without the last PO displayed)

I am using user exit FUNCTION EXIT_SAPMM06E_014 - ZXM06U45 to check a custom auth object and then limit their abiltiy to change the PO. Because the PO displays based on prior activity this is causing me a problem.

I really appreciate your time!

Thanks for any ideas or information on where the defaulted PO comes from!

DF