How To Fix PPH_MRP031 - Error: Duplicate internal key exists

SAP Error Message - Details

• Message type: E = Error

• Message class: PPH_MRP -

• Message number: 031

• Message text: Error: Duplicate internal key exists

What causes this issue?

The system uses internal keys to uniquely identify MRP elements during
the MRP Live run on HANA. The system has detected that some keys are not
unique and have been used to identify multiple elements.

System Response

The comparison report provides a function that lists all the elements
from the MRP Live run on HANA with duplicate internal keys.

How to fix this error?

Inform SAP by creating a support ticket. Please provide information on
how to replicate the problem and attach the list of elements with
duplicate internal keys as is provided by the report.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PPH_MRP031 - Error: Duplicate internal key exists ?

  The SAP error message PPH_MRP031: Duplicate internal key exists typically occurs in the context of Material Requirements Planning (MRP) when the system encounters duplicate entries in the planning data. This can happen during the planning run or when processing MRP-related transactions.
  Causes:
  
  Duplicate Entries: The most common cause is that there are duplicate entries in the MRP tables, which can occur due to incorrect data input or issues during data migration.
  Configuration Issues: Incorrect configuration settings in the MRP parameters or master data can lead to duplicates being generated.
  Data Consistency Issues: Inconsistencies in the master data (like material master, BOM, routing) can also lead to this error.
  Custom Developments: If there are custom programs or enhancements that manipulate MRP data, they might inadvertently create duplicates.
  
  Solutions:
  
  
  Check for Duplicates: 
  
  Use transaction codes like SE16 or SE11 to check the relevant MRP tables (e.g., MDVM, MDKP) for duplicate entries. 
  Identify and remove or correct the duplicates.
  
  
  
  Data Cleanup: 
  
  If duplicates are found, you may need to clean up the data. This could involve deleting or merging duplicate records, depending on the business requirements.
  
  
  
  Review Configuration: 
  
  Check the MRP configuration settings in the customizing (transaction SPRO) to ensure that they are set up correctly and do not allow for duplicate entries.
  
  
  
  Master Data Review: 
  
  Review the material master data, BOMs, and routings to ensure there are no inconsistencies or duplicates that could lead to this error.
  
  
  
  Run MRP in Test Mode: 
  
  If you are unsure about the changes, run MRP in test mode to see if the error persists without affecting live data.
  
  
  
  Consult SAP Notes: 
  
  Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide patches.
  
  
  
  Contact SAP Support: 
  
  If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MD01 (MRP Run), MD02 (Single-item, Multi-level MRP), and MD04 (Stock/Requirements List) to analyze the MRP data.
  MRP Tables: Understand the key MRP tables involved, such as:
  
  MDVM: MRP Area
  MDKP: MRP Document Header
  MDTB: MRP Table for MRP Elements
  
  
  Documentation: Review SAP documentation and best practices for MRP to ensure proper setup and maintenance of planning data.
  
  By following these steps, you should be able to identify the cause of the PPH_MRP031 error and implement a solution to resolve it.