How To Fix M8108 - Check if invoice already entered under journal entry & &

M8108 - Overview

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 108

• Message text: Check if invoice already entered under journal entry & &

What causes this issue?

The system is required to perform a check to prevent duplication of
invoice entry for the supplier whose invoice you are currently entering.
An invoice with data that corresponds to your data for the following
fields has already been entered in accounting numbered &V1&:
Company Code
Document Date
Reference
Currency
Supplier
Amount
It is likely that the same invoice will be entered twice.

INCLUDE MM_IV_MELDUNGEN OBJECT DOKU ID TX

How to fix this error?

Check your input and correct it if necessary. If your input is correct,
compare the current invoice with the original document of invoice &V1&.

Error message extract from SAP system. Copyright SAP SE.

M8108 - Details

• The SAP error message M8108 typically indicates that there is an issue with the invoice processing in the system, specifically that the invoice you are trying to enter may already exist in the system under a journal entry. This can happen for various reasons, such as duplicate entries or issues with the invoice number.
  
  Cause:
  
  Duplicate Invoice: The invoice you are trying to enter may already exist in the system. SAP checks for duplicate entries to prevent double posting.
  Incorrect Invoice Number: The invoice number you are entering might be incorrect or formatted improperly.
  Posting Period Issues: The posting period may be closed, preventing new entries from being made.
  
  Configuration Issues: There may be configuration settings in the system that are causing the error.
  
  
  Solution:
  
  
  Check for Existing Invoices: 
  
  Use transaction codes like FB03 (Display Document) or MIRO (Enter Incoming Invoice) to check if the invoice has already been entered.
  Search for the invoice number in the system