How To Fix ME799 - MPN material & not allowed or not found

ME799 - Overview

• Message type: E = Error

• Message class: ME - Purchasing: General Messages

• Message number: 799

• Message text: MPN material & not allowed or not found

What causes this issue?

The shipping notification for purchase order no. &V3&, item &V4&, cannot
be adopted.
When determining the MPN material from the MPN and manufacturer shown in
the IDoc, the system did not find MPN material &V1&.
The error may be due to one of the following reasons:

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

The MPN material was not found (value: '_') - i.e. the MPN/manufacturer
combination does not exist in your system.
The MPN material &V1& was found but does not tally with the MPN material
&V2& in the IDoc.
The MPN material &V1& was found but does not tally with the
inventory-managed material of the purchase order.

How to fix this error?

You have the following options:
Adjust your inventory-managed material so that this MPN material is also
allowed.
Change the MPN material in the IDoc.
Get the supplier to send you a new shipping notification with a suitable
material number or suitable combination of MPN and manufacturer.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ME799 - MPN material & not allowed or not found ?

  The SAP error message ME799 typically indicates that there is an issue with the Material Master data related to a Material Part Number (MPN) in the context of procurement or purchasing processes. This error can occur when the system cannot find the specified MPN or when the MPN is not allowed for the transaction you are trying to perform.
  Causes of ME799 Error
  
  Missing MPN Data: The MPN may not be defined in the system for the material you are trying to use.
  Incorrect MPN Assignment: The MPN may not be correctly assigned to the material in the Material Master.
  Material Status: The material may be blocked or inactive, preventing its use in transactions.
  Vendor Data Issues: The vendor associated with the MPN may not have the correct data or may not be set up to supply that MPN.
  
  Configuration Issues: There may be configuration settings in the system that restrict the use of certain MPNs.
  
  Solutions