Message type: E = Error
Message class:  IW - Order Processing 
Message number: 293
Message text: No negative quantity specification allowed for non-stock materials
You have entered a negative quantity entry for a non-stock material.
This is not allowed.
INCLUDE KEINE-VERARBEITUNG OBJECT DOKU ID TX LANGUAGE EN
If you want to return the ordered non-stock material to the
<DS:GLOS.vendor>vendors</>, you must enter a return delivery to the
vendors for the <DS:GLOS.purchase_order>purchase order</>, for the
<DS:GLOS.goods_receipt>goods receipt</>.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message IW293: No negative quantity specification allowed for non-stock materials typically occurs when you are trying to perform a transaction that involves a non-stock material (such as a service or a consumable) and you attempt to enter a negative quantity. This is not allowed in SAP for non-stock materials, as they are not managed in inventory and thus cannot have negative quantities.
Cause: Negative Quantity Entry: You are trying to enter a negative quantity for a non-stock material in a transaction, such as a goods movement or a service entry sheet. Incorrect Document Type: The document type you are using may not support negative quantities for non-stock materials.
Configuration Issues: There may be configuration settings in the material master or the movement type that restrict negative quantities for non-stock materials.
Solution: Check Quantity Entry: Ensure that you are entering a positive quantity for the non-stock material. If you need to adjust quantities, consider
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