How To Fix UMK842 - You have to display the master data assignment before data can be written

SAP Error Message - Details

• Message type: E = Error

• Message class: UMK - Measures

• Message number: 842

• Message text: You have to display the master data assignment before data can be written

What causes this issue?

Before you can write any data, you have to display the master data
assignments at least once.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Display the master data assignments by choosing the <NP>Master Data</>
tab page.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UMK842 - You have to display the master data assignment before data can be written ?

  The SAP error message UMK842, which states "You have to display the master data assignment before data can be written," typically occurs in the context of master data management, particularly when dealing with assignments or relationships between different master data objects (like materials, vendors, customers, etc.).
  Cause:
  This error usually arises when you attempt to perform an operation (like creating or updating data) without first displaying or accessing the relevant master data assignment. The system requires that you first view the existing assignments to ensure that the data integrity is maintained and that you are aware of the current state of the master data.
  Solution:
  To resolve this error, follow these steps:
  
  
  Display Master Data Assignment:
  
  Navigate to the relevant transaction or screen where you are trying to perform the operation.
  Before proceeding with your intended action (like creating or updating), ensure that you display the master data assignment. This can usually be done by selecting the appropriate option to view or display the master data.
  
  
  
  Check for Existing Assignments:
  
  Review the existing assignments to ensure that they are correct and that you understand the current relationships between the master data objects.
  
  
  
  Perform the Intended Action:
  
  After displaying the master data assignment, you should be able to proceed with your intended action without encountering the error.
  
  
  
  Consult Documentation:
  
  If you are unsure about how to display the master data assignment, refer to the SAP documentation or help resources specific to the module you are working with.
  
  
  
  User Permissions:
  
  Ensure that you have the necessary permissions to view and modify the master data. Lack of appropriate authorizations can also lead to issues.
  
  
  
  Related Information:
  
  Transaction Codes: Depending on the specific master data you are working with, you may need to use different transaction codes (e.g., MM01 for material master, XK01 for vendor master).
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  Support: If the issue persists after following the above steps, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to resolve the UMK842 error and proceed with your work in SAP.