A computer program, method, and systems for monitoring inbound documents. Each of these inbound documents, which concerns the delivery of inbound merchandise to a processing center, itemizes one or more available products included in the inbound merchandise. Outbound documents, each of which concerns the shipping of outbound merchandise from the processing center, are also monitored. These outbound documents each itemize one or more needed products to be included in the outbound merchandise. The available products itemized in one or more inbound documents are compared to the needed products itemized in one or more outbound documents to determine if a match occurs. If such a match occurs, the matched available and needed products are linked, such that an outstanding order for a needed product is fulfilled with an available product.