/SCWM/ADGI does not have a storage location check in its NWLO procedure. By storage location I mean the non-EWM warehouse field. If a GM is posted for a storage location which does not exist then the queue gets stuck in SMQ2. I need a validation to be set on this field so that the storage location is always checked before the GM is posted. The EWM Performance Assistant tells me that a customer-specific check can be implemented using the BAdI /SCWM/EX_CORE_GM_STOCK. Can someone please guide me through the logic that I would require to successfully implement this validation?