How To Fix MG529 - The material & must not occur more than once in the processing block

SAP Error Message - Details

• Message type: E = Error

• Message class: MG - Batch input: material master

• Message number: 529

• Message text: The material & must not occur more than once in the processing block

What causes this issue?

You have specified the material &V1& more than once in a block of
transactions. This is not allowed.

System Response

The material is processed only the first time it occurs in
the data. Each subsequent time it occurs, the system issues this error
message.

How to fix this error?

Make sure that each material occurs only once in a block of
transactions. This applies to the following data:
Header record
Variants table
MARA segment table

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MG529 - The material & must not occur more than once in the processing block ?

  The SAP error message MG529, which states "The material & must not occur more than once in the processing block," typically occurs during the processing of materials in various transactions, such as during inventory management, goods movements, or when creating purchase orders. This error indicates that the same material number has been entered multiple times in a single processing block, which is not allowed.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that the same material number has been entered more than once in the same transaction or processing block.
  Batch Input Sessions: If you are using batch input sessions or uploading data, the error may arise from duplicate entries in the data being processed.
  Custom Programs or Enhancements: If there are custom programs or enhancements that manipulate material data, they may inadvertently cause duplicate entries.
  
  Solution:
  
  Check for Duplicates: Review the transaction or input data to ensure that the same material number is not listed more than once. Remove any duplicates.
  Data Uploads: If you are uploading data, ensure that your source data does not contain duplicate entries for the same material.
  Review Custom Code: If you suspect that custom code is causing the issue, review the logic to ensure it handles material entries correctly and does not allow duplicates.
  Transaction Review: If the error occurs during a specific transaction, check the transaction's input fields to ensure that each material is entered only once.
  Consult Documentation: Refer to SAP documentation or help resources for the specific transaction you are using to understand the expected input format and constraints.
  
  Related Information:
  
  Transaction Codes: This error can occur in various transaction codes related to material management, such as MIGO (Goods Movement), MB1A (Goods Withdrawal), or ME21N (Create Purchase Order).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. Sometimes, SAP releases notes that address specific bugs or provide guidance on handling certain errors.
  User Forums: Consider searching or posting in SAP community forums or user groups for additional insights or solutions from other users who may have encountered the same issue.
  
  By following these steps, you should be able to identify the cause of the MG529 error and implement a solution to resolve it.