EDI Import Staging Documents

We have multiple Operating Units and we are using E-commerce gateway to import Customer POs into Order Management. As of now we have only one responsibility to perform the inbound transaction. The documents from various Operating Units that fail to process show up in Staging/Skipped documents. But there is no way to segregate the skipped documents based on Operating Unit. Currently each of our trading partner (in this case Customer site) is specific to an Operating Unit.
If we use separate responsibilities for each Operating Unit to import, will the staging documents show the skipped documents for that Operating Unit only? If yes, how will the import work? Do we need to have separate data import files? Customers will send data only for one EDI location and EDI Location and Translator Code have one-to-one mapping, so how can we have two separate data files?