How To Fix M8246 - Purchasing document and supplier cannot be entered together

M8246 - Overview

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 246

• Message text: Purchasing document and supplier cannot be entered together

What causes this issue?

You have allocated this invoice to a purchasing document or a delivery
note and you have also entered a supplier. You can only do this for
planned delivery costs.

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?

If you wish to enter an invoice for delivery costs, select the field
<LS>Planned delivery costs</>.
Otherwise you can only enter either a purchasing document/delivery note
OR a supplier. If you acknowledge this message by pressing <LS>Enter</>,
the system will automatically delete your entry in the field
<LS>Supplier</>.
Note: At present the system does not support entering a different
invoicing party.

Error message extract from SAP system. Copyright SAP SE.

M8246 - Details

• The SAP error message M8246 ("Purchasing document and supplier cannot be entered together") typically occurs in the context of creating or processing purchasing documents, such as purchase orders or purchase requisitions. This error indicates that there is a conflict between the purchasing document and the supplier information being entered.
  
  Cause:
  
  Inconsistent Data: The purchasing document (like a purchase order) may already have a supplier assigned, and the system does not allow you to enter a different supplier in the same transaction.
  Document Type Restrictions: Certain document types may have restrictions on how suppliers can be assigned or changed.
  
  Configuration Issues: There may be configuration settings in the SAP system that restrict the combination of purchasing documents and suppliers.
  User Input Error: The user may have inadvertently entered conflicting information, such as trying to assign a supplier to a document that is not meant to have one.
  
  
  Solution:
  
  Check Existing Supplier Assignment: Verify if the purchasing document already