How To Fix /SAPAPO/CTM4423 - The selection contains invalid sources of supply for external procurement

/SAPAPO/CTM4423 - Overview

• Message type: E = Error

• Message class: /SAPAPO/CTM4 -

• Message number: 423

• Message text: The selection contains invalid sources of supply for external procurement

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/CTM4423 - The selection contains invalid sources of supply for external procurement ?

  The SAP error message /SAPAPO/CTM4423 indicates that there are invalid sources of supply for external procurement in the context of the SAP Advanced Planning and Optimization (APO) module, specifically when using the Capable-to-Match (CTM) functionality. This error typically arises during the planning process when the system encounters issues with the sources of supply that are defined for external procurement.
  
  Cause:
  
  Invalid Source of Supply: The source of supply (e.g., vendor, contract) may not be valid for the material or may not be set up correctly in the system.
  Missing or Incorrect Data: There may be missing or incorrect data in the master data for the material, vendor, or purchasing info records.
  Planning Area Configuration: The planning area may not be configured correctly to include the necessary sources of supply.
  Source List Issues: The source list for the material may not include valid external procurement options.
  Procurement Type: The procurement type for the material may not allow