How To Fix REXCRACH036 - Invoice number for due date &1 is not unique

REXCRACH036 - Overview

• Message type: E = Error

• Message class: REXCRACH - Messages Assignment of ISR-Ref. Vendor Invoice to Cash Flow

• Message number: 036

• Message text: Invoice number for due date &1 is not unique

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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REXCRACH036 - Details

• The SAP error message REXCRACH036 indicates that there is a problem with the uniqueness of invoice numbers for a specific due date in the context of the SAP system, particularly in the area of accounts receivable or accounts payable. This error typically arises when the system encounters multiple invoices with the same invoice number for the same due date, which violates the requirement for unique identification of invoices.
  
  Cause:
  
  Duplicate Invoices: The most common cause is that there are duplicate invoices entered into the system for the same due date.
  Data Entry Errors: Manual data entry errors can lead to the same invoice number being assigned to different transactions.
  Integration Issues: If there are integrations with other systems (like third-party billing systems), they might be sending duplicate invoice numbers.
  
  Configuration Issues: Incorrect configuration in the invoice processing settings can lead to this error.
  
  
  Solution:
  
  
  Identify Duplicates: 
  
  Use transaction codes like SE16 or SE11 to check the relevant