How To Fix EL179 - Internal error: list of MR reasons cannot be called

SAP Error Message - Details

• Message type: E = Error

• Message class: EL - IS-U meter reading data processing

• Message number: 179

• Message text: Internal error: list of MR reasons cannot be called

What causes this issue?

If the meter reading reason is not clear, an * is displayed. By using
F2 on the meter reading reason field, a list of the corresponding meter
reading reasons, installations, billing date, and meter reading unit is
displayed. Internal error: these values could not be determined.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EL179 - Internal error: list of MR reasons cannot be called ?

  The SAP error message EL179, which states "Internal error: list of MR reasons cannot be called," typically occurs in the context of Material Requirements Planning (MRP) or when dealing with material master data. This error indicates that there is an issue with the internal processing of the system, particularly related to the list of material requirements (MR) reasons.
  Possible Causes:
  
  Configuration Issues: There may be a misconfiguration in the MRP settings or in the material master data.
  Missing or Incomplete Data: Required data for the material or MRP reasons may be missing or incomplete.
  System Bugs: There could be a bug in the SAP system or a specific transaction that is causing the error.
  Authorization Issues: The user may not have the necessary authorizations to access the required data.
  Transport Issues: If the system has recently undergone a transport of changes, it may not have been properly executed or completed.
  
  Solutions:
  
  Check Configuration: Review the MRP configuration settings in the system. Ensure that all necessary parameters are correctly set up.
  Verify Material Master Data: Check the material master records for completeness. Ensure that all required fields are filled out and that the material is properly defined.
  Review Authorizations: Ensure that the user has the necessary authorizations to access the MRP reasons and related data.
  Check for System Notes: Look for any SAP Notes or patches that may address this specific error. SAP frequently releases updates to fix known issues.
  Debugging: If you have access to debugging tools, you can try to debug the transaction to identify where the error is occurring.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance. Provide them with the error message details and any relevant transaction codes.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MD01 (MRP Run), MD02 (Single-item, Multi-level Planning), and MM02 (Change Material).
  SAP Notes: Search the SAP Support Portal for notes related to EL179 or MRP issues.