You are using Release process, you create an ASN and the Due qty is reduced. When you create the GR for ASN, the Due qty is reopened.
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SAP Supply Network Collaboration
SAP Supply Network Collaboration, SAP SNC, Advanced Shipping Notification, ASN, Due Quantity, due qty, release, GR, Goods Receipt, timestamp, time stamp, schedule line, quantity , KBA , SCM-ICH-ASN , Advanced Shipping Notification , How To
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