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

M8508 - Overview

• 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.

M8508 - Details

• 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