SAP Knowledge Base Article - Public

1720124 - Error Message "Changing The Conversion Not Possible" While Editing Quantity Conversion of Material or Service


You are trying to change or delete a quantity conversion maintained in a material or service's master data, when system raises an error message such as the ones below or something similar:

  • Changing the conversion not possible; it is used by one or more open procurement price lists, source documents for supplier invoices
  • Changing the conversion not possible; it is used by one or more open customer quotes, procurement price lists, purchase orders, sales orders, source documents for supplier invoices
  • Changing the conversion not possible; it is used by one or more open stock items


SAP Business ByDesign

Reproducing the Issue

  1. Go to Product Data work center.
  2. Access the Materials or the Services work center view.
  3. Locate and select the relevant material/service.
  4. Click the Edit button.
  5. Click the View All button.
  6. In the General tab, scroll down to Quantity Conversion section.
  7. Try to delete or change a quantity conversion.
  8. Error message is raised.


The relevant material or service is already used in one or more documents of the type(s) mentioned in the error message, so it is:

  1. Not possible to modify the existing quantity conversion.
  2. Not possible to remove the existing quantity conversion.
  3. Not possible to have another row with a different value for the same UoM (unit of measure) combination.

The reason for this is that the business documents which are using this material or service would end up in inconsistency if the change was allowed.

The veto check executed is not at quantity conversion level, but rather at material/service level: if that material/service is being used in a document, even if the quantity conversion used is one other than the one you intend to delete or change, the system will still block the action.


In some cases, closing or canceling the documents which are using the relevant material/service might allow changing the quantity conversion (NOTE: this logic is application-specific, so it does not apply to all documents and might not be a solution in your case).

You can use the available standard reports related to document type appearing in the error to check which documents are using the material/service in question.

Changes to the quantity conversion directly in the backend are also not supported by SAP. The proper workaround that SAP advises is to create a new material/service with the same details as the existing one, maintaining the correct quantity conversions, then blocking the previous material/service for further use.

Should you wish to request that this functionality be changed or enhanced in any way, please provide your feedback in our SAP Continuous Customer Influence portal.


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