How To Fix M8508 - Automatic assignment not possible when criteria change

SAP Error Message - Details

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 508

• Message text: Automatic assignment not possible when criteria change

What causes this issue?

You have changed the allocation criteria in the invoice overview.

System Response

The system cannot carry out automatic allocation.

How to fix this error?

The change in the allocation criteria only affect the items selected if
you carry out the check again. To do this, change the Invoice
Verification type to 1 or 2 (Verification in the background) and save
the document.
Alternatively, you can branch into the item screen and change the
allocation criteria. If you wish, changing the criteria here leads to
the allocation criteria being evaluated and possibly to new items being
selected.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M8508 - Automatic assignment not possible when criteria change ?

  The SAP error message M8508, which states "Automatic assignment not possible when criteria change," typically occurs in the context of material management and inventory management processes, particularly when dealing with automatic assignment of stock or materials in SAP.
  Cause:
  This error usually arises when there is a change in the criteria that are used for automatic assignment. The criteria can include various parameters such as:
  
  Material number
  Plant
  Storage location
  Batch number
  Valuation type
  
  When the system attempts to automatically assign stock based on these criteria, if there is a change in any of the parameters that are used for the assignment, the system cannot proceed with the automatic assignment, leading to this error.
  Solution:
  To resolve the M8508 error, you can take the following steps:
  
  
  Check the Assignment Criteria: Review the criteria that are being used for the automatic assignment. Ensure that they are consistent and have not changed unexpectedly.
  
  
  Manual Assignment: If automatic assignment is not possible due to the criteria change, consider performing a manual assignment of the stock or materials. This can be done through the relevant transaction codes in SAP.
  
  
  Review Configuration: Check the configuration settings in the system related to automatic assignment. Ensure that the settings are correctly defined and that there are no discrepancies.
  
  
  Analyze the Process Flow: Look into the process flow that led to the error. Identify any recent changes in the process that might have affected the assignment criteria.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on the error message and the context in which it occurs.
  
  
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance. They may provide insights based on the specific configuration and version of your SAP system.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MB1A, MB1B, or MIGO, which are used for goods movements and inventory management.
  SAP Notes: Check for any SAP Notes related to error M8508, as they may provide additional context or solutions.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to diagnose and resolve the M8508 error in your SAP system.