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

UMK842 - Overview

• 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.

UMK842 - Details

• 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