How To Fix APPLG005 - DC: Master cannot be assigned to DC; DC already has a master

SAP Error Message - Details

• Message type: E = Error

• Message class: APPLG - Application Graphics Messages (Graphic Proxy Framework)

• Message number: 005

• Message text: DC: Master cannot be assigned to DC; DC already has a master

What causes this issue?

An attempt was made to give a data container a second master.

How to fix this error?

Check the call method.
The master is the application that creates the data container.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message APPLG005 - DC: Master cannot be assigned to DC; DC already has a master ?

  The SAP error message APPLG005 indicates that there is an issue with the assignment of a master data object (like a material or a vendor) to a distribution center (DC) because the DC already has a master assigned to it. This typically occurs in the context of logistics or supply chain management within SAP, particularly when dealing with master data assignments.
  Cause:
  
  Existing Assignment: The primary cause of this error is that the distribution center (DC) you are trying to assign a master to already has another master assigned to it. In SAP, each DC can only have one master assigned at a time for certain types of master data.
  Data Integrity Rules: SAP enforces data integrity rules to prevent conflicts and ensure that each DC is uniquely associated with a master data object.
  
  Solution:
  To resolve the APPLG005 error, you can take the following steps:
  
  
  Check Existing Assignments:
  
  Go to the relevant transaction (e.g., MM02 for material master) and check the current assignments for the DC in question.
  Identify which master is currently assigned to the DC.
  
  
  
  Remove Existing Assignment:
  
  If you need to assign a new master to the DC, you will first need to remove the existing assignment. This can typically be done in the same transaction where you check the assignments.
  For example, if it’s a material master, you can use MM02 to change the master data and remove the assignment from the DC.
  
  
  
  Reassign the Master:
  
  After removing the existing assignment, you can proceed to assign the new master to the DC.
  
  
  
  Consult Documentation:
  
  If you are unsure about the implications of changing master assignments, consult your organization's documentation or SAP help resources to understand the impact on inventory, logistics, and reporting.
  
  
  
  Check for Customizations:
  
  If your organization has custom developments or enhancements in place, check with your SAP technical team to ensure that there are no additional constraints or rules that might be causing this error.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material) for managing material master data.
  Master Data Management: Understanding the principles of master data management in SAP can help prevent similar issues in the future.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as SAP frequently updates its software and documentation.
  
  By following these steps, you should be able to resolve the APPLG005 error and successfully manage your master data assignments in SAP.