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SAP Note: [url=http://service.sap.com/sap/support/notes/160970]160970 - Change valuation class: production order/purchase order[/url] pisze:Symptom
You want to change the valuation class of a material. The system does not permit this change because outstanding purchase orders or production orders that have not been deleted still exist for the material.
If you want to change the material type of a material and, based on the new material type, a different valuation class must be assigned to the material, this change is not permitted if either outstanding production orders or purchase orders still exist.

Solution
As of Release 4.6B, you can use Customizing transaction OMT4 (Change System Messages) to change the corresponding checks to warning messages. In this case, you must ensure from an organizational viewpoint that no inconsistencies can occur after a valuation class is changed.

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When you change the material type, the warning message for open purchase orders and scheduling agreements can only be issued if the settings for the quantity and value update of the new and old material type are the same. Otherwise, an error message in displayed and the material type cannot be changed.

fuzjer pisze:Poszło usuwając pozycję zamówień.

grincz pisze: Zakoszowanie wszystkich pozycji na zamówieniach i brak zapasu w obecnym okresie wystarczyło do zmiany klasy wyceny.