Let's say we have scenario with one SRM and multiple back end system with ECS scenario. When I create SC with material item in table BBP_PDBEI, BE_LOG_SYSTEM is always filled with SRM logical system ( not the back end logsys). I see LOGSYS_FI is filled with actual logical system of the backend. Now question is when PO gets copied to back end, how the systems determines which system it has to post the PO? is it based on LOGSYS_FI? how this field is determined? is it from the System_alias attribute from PPOMA. if Yes, can we have multiple values for this attribute?