Need to block vendor stock, type O. I need mvmt 342 or 344?

Hello,

I'm attempting to block stock provided to a vendor (type O) so that MRP doesn't consider it usable, until we decide what to do with it. Unfortunately, SAP doesn't allow movement 344 to be used with type O stock, and movement 342, which should work, won't show up in MIGO or MIGO_TR.

I have not been able to change configuration for movement 342 to make it show up in MIGO, and I have not been able to add stock type O to the allowed stock types for movement 344.

Is there another way to block this stock type, and if not, which configuration should I modify, and how can I find the transactions to configure this?

Thanks,

Randy