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Erik, Your on the right track but you need to adjust the scenarios based on the fact that the two products are different and, therefore, their MD5 checksums are different; therefore, the existence of one in the queue won't cause the other to be rejected. Thus, your first scenario is more correct this way: 1. LDM-A receives file-version1 in queue from CPNRS. LDM-A saves it to disk. 2. LDM-A receives file-version2 in queue from CPNRS. LDM-A overwrites file-version1 on disk with file-version2. 3. LDM-A clears file-version1 from queue to make room for more products. 4. LDM-A receives file-version1 from LDM-B. LDM-A overwrites file-version2 on disk with file-version1. 5. LDM-A receives file-version2 from LDM-B, but since it still has file-version2 in queue, this gets rejected. 6. LDM-A clears file-version2 from queue to make room for more products. *End Result: LDM-A ends with file-version1 on disk. Regards, Steve Emmerson Ticket Details =================== Ticket ID: GBK-975146 Department: Support LDM Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.