Block Supplier Activity

Hi,

I require to block a Supplier transactions like, PO generation, PO Updates & PO Receipts.

We have BaaN IVc4 and I have changed in tccom2101m000 - Maintain Suppliers the Supplier status from Actual to Paym. & Purch. Entr. Bl.

This prevents/blocks creating PO or adding PO Lines to existing PO's, but the user still is able to change existing PO lines quantities and also is able to process receipts.

Is there another setting that I can activate to block PO changes or to block receipts?:confused:

Thanks in advance for your help.