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Dokumentation

ME020 - Item category &3 not allowed with document type &1 - ME 020

Diagnosis

The combination of document type and item category entered cannot be used because it has not been defined in Customizing for Purchasing.

Example
You have created a purchase order of the document type "standard PO" with reference to a contract. The contract item you are referencing has the item category M (material unknown) or W (material group). This item category was adopted in the PO.
If the combination of document type "standard PO" and item category M or W has not been defined in Customizing for Purchasing, you must use a valid combination of item category and document type.

Procedure

Check your input and change the item category if necessary.

Note
If you wish to create a stock transport order (with item category U), you must invoke the function Purchase order -> Create -> Stock transfer or use the order type stock transport order.