How To Fix M8428 - Field &1 must not be filled in purchase orders for external services

SAP Error Message - Details

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 428

• Message text: Field &1 must not be filled in purchase orders for external services

What causes this issue?

You are entering a purchase order for external services, and have set
the final invoice indicator. For technical reasons, this is not
permitted. The system automatically sets the final invoice indicator.

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?

Check the entries in the followingg fields:
Table HeaderData, field BLLSRV_IND (Service indicator)
Table ItemData, field FINAL_INV (Final invoice indicator)
If the BLLSRV_IND field is filled, then the FINAL_INV field must not be
filled.

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 M8428 - Field &1 must not be filled in purchase orders for external services ?

  The SAP error message M8428, which states "Field &1 must not be filled in purchase orders for external services," typically occurs when there is an issue with the configuration or data entry related to purchase orders for external services in the SAP system. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Incorrect Field Usage: The error indicates that a specific field (denoted by &1) is being filled in a purchase order for external services, which is not allowed. This could be due to incorrect data entry or misunderstanding of the field's purpose.
  Configuration Issues: The system may be configured in such a way that certain fields are not supposed to be filled when creating purchase orders for external services.
  Service Master Data: The service master data may have incorrect settings or attributes that lead to this error when creating or modifying purchase orders.
  
  Solution:
  
  Review the Purchase Order: Check the purchase order in question and identify which field is causing the error. Ensure that the field is not filled in when creating or modifying purchase orders for external services.
  Consult Documentation: Refer to SAP documentation or help files to understand the specific requirements for purchase orders related to external services.
  Adjust Configuration: If you have access to configuration settings, review the settings for external services in the purchasing module (MM). Ensure that the configuration aligns with business requirements and that fields are set up correctly.
  Service Master Data: Check the service master data for any inconsistencies or incorrect settings that might be causing the issue. Make sure that the service is correctly defined and that all necessary fields are appropriately configured.
  User Training: If the error is due to user input, consider providing training or guidelines to users on how to correctly create purchase orders for external services.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME21N (Create Purchase Order), ME22N (Change Purchase Order), and ME23N (Display Purchase Order) to navigate and troubleshoot effectively.
  Support: If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to identify the cause of the M8428 error and implement a solution to resolve it.