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

SAP Error Message - Details

• 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

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• What is the cause and solution for SAP error message REXCRACH036 - Invoice number for due date &1 is not unique ?

  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 tables (e.g., BKPF, BSEG) for duplicate entries. Look for the invoice number and due date combination.
  
  
  
  Correct Data: 
  
  If duplicates are found, determine which invoice is valid and correct or delete the duplicates as necessary.
  Ensure that the invoice numbers are unique for each due date.
  
  
  
  Review Integration Settings: 
  
  If the issue is related to data coming from an external system, review the integration settings to ensure that they are not sending duplicate invoices.
  
  
  
  Check Configuration: 
  
  Review the configuration settings in the SAP system related to invoice processing to ensure that they are set up correctly to prevent duplicates.
  
  
  
  User Training: 
  
  Provide training to users on how to enter invoices correctly to avoid duplicates.
  
  
  
  Implement Validation Rules: 
  
  If possible, implement validation rules in the system to prevent the entry of duplicate invoice numbers for the same due date.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB60 (Enter Incoming Invoices), FB70 (Enter Outgoing Invoices), and FBL1N (Vendor Line Item Display) to manage invoices.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation for best practices in invoice management and data entry to minimize the occurrence of such errors.
  
  By following these steps, you should be able to resolve the REXCRACH036 error and ensure that invoice numbers remain unique for each due date in your SAP system.