APO ATP CHECK with RLT

Hello Sap Gurus ,

How are you?

I need your help with ATP check confirmation outside checking Horizon.

My client needs to perform ATP check considering "CONFIRMATION at CHECKING HORIZON" using ATP Group (A) and for orders outside horizon, perform the confirmation with checking requirements and receipts elements and not confirm without check as into standard.

Ex:

Inside Horizon we will consider for confirmation Stock , Purchase Requisition and STR for orders outside horizon we will confirm against Stock and Purchase Requisitions.

For same Product x Location It is possible to perform ATP Check "A" if order is inside horizon or ATP Check "B" if order is outside horizon ?

Thank You

MJ