Return Quantity Vs Returnable Quantity

The SAP S/4HANA Fiori app Manage Customer Returns is the central application to process customer returns.  As a returns and refund clerk, you can create accelerated customer returns with reference to a preceding document, such as a sales order or an invoice.

When creating a customer return with reference, you need to select a reference document first. For each customer return item, you must enter a quantity that needs to be returned. The returnable quantity of each item is calculated by subtracting the already-returned quantity from the original quantity of the reference item.

However, with the current design, the system will not stop you from entering a quantity larger than the returnable quantity. When you do, you can complete your creation successfully without being alerted by any information message.

This is a by-design logic not a defect. 

The reason behind is that there are cases where multiple customer returns can refer to the same reference document. Here, the reference document only serves to create a customer return (not really as a reference).  In such cases, the return quantity doesn't have to be relevant for the reference document, and therefore you can enter any quantity according to your actual needs.

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In future releases, we plan to add an information message to catch your attention when you enter a quantity larger than returnable quantity.