Currently there is no ability for the firming process to group planned purchase orders based on the warehouse location of the selected lines. Specifically, when applying a firming timefence to a coverage group associated with an item to be delivered to multiple warehouse locations, the system groups all planned lines to a single Purchase Order during the automated firming process.   

Managing the PO receipt and invoice process for a single Purchase Order across many warehouse locations is not always practical. The firming timefence allows for efficient/automated PO creation, but the lack of grouping POs based on the warehouse location limits the usage. 

Including an additional option to 'Group by Warehouse' within the MRP configuration would fill this gap.