How To Fix MMRP01333 - Loop at line &1

SAP Error Message - Details

• Message type: E = Error

• Message class: MMRP01 - Rapid Planning Matrix

• Message number: 333

• Message text: Loop at line &1

What causes this issue?

The sequence of line segments can go back on itself, that means there
is a series of line segements (A1, A2, ..., Ax) whereby each segment Ai
(where i is the number of the current segment) is the predecessor of
A(i+1) and Ax is the predecessor of A1.

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?

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 MMRP01333 - Loop at line &1 ?

  The SAP error message MMRP01333, which states "Loop at line &1," typically occurs in the context of material master data processing, particularly when dealing with material requirements planning (MRP) or inventory management. This error indicates that there is a loop in the processing logic, which can happen due to various reasons, such as incorrect configuration, data inconsistencies, or issues in the master data.
  Causes:
  
  Data Inconsistencies: There may be inconsistencies in the material master data, such as circular references or incorrect settings in the MRP views.
  Configuration Issues: Incorrect configuration in the MRP settings or in the related modules can lead to loops in processing.
  Custom Code: If there are custom enhancements or user exits that manipulate MRP data, they might inadvertently create loops.
  Master Data Issues: Problems with the material master records, such as missing or incorrect data in the relevant fields.
  
  Solutions:
  
  Check Material Master Data: Review the material master records for the materials involved. Ensure that all required fields are filled out correctly and that there are no circular references.
  Review MRP Configuration: Check the MRP configuration settings in the system. Ensure that the settings are appropriate for the materials being processed.
  Analyze Custom Code: If there are any custom developments related to MRP, review the code to ensure that it does not create loops or unintended behavior.
  Debugging: Use the SAP debugger to trace the execution of the program that is generating the error. This can help identify the exact point where the loop occurs.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error. There may be patches or updates that resolve known issues.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that no new issues have been introduced.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like MM02 (Change Material), MM03 (Display Material), or MD04 (Stock/Requirements List) to investigate the material master data and MRP settings.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  Documentation: Review SAP documentation related to MRP and material master data management for best practices and troubleshooting steps.
  
  If the issue persists after trying the above solutions, it may be beneficial to involve your SAP Basis or technical team for further investigation.