How To Fix /SAPAPO/CTM4420 - Enter a source of supply for in-house production

/SAPAPO/CTM4420 - Overview

• Message type: E = Error

• Message class: /SAPAPO/CTM4 -

• Message number: 420

• Message text: Enter a source of supply for in-house production

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/CTM4420 - Enter a source of supply for in-house production ?

  The SAP error message /SAPAPO/CTM4420 indicates that there is no source of supply defined for in-house production 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 attempts to allocate production orders but cannot find a valid source of supply.
  
  Cause:
  
  Missing Source of Supply: The most common cause is that the material in question does not have a defined source of supply for in-house production in the planning data.
  Incorrect Master Data: The material master or the production version may not be set up correctly, leading to the absence of a valid production resource.
  Planning Parameters: The planning parameters for the product may not be configured to allow in-house production.
  Resource Availability: The production resources may not be available or may not be defined for the specific material.
  
  
  Solution:
  
  
  Define Source of Supply:
  
  Go to the material