How To Fix ISJP602 - Line item is already included in Monthly Invoice &1 &2

SAP Error Message - Details

• Message type: E = Error

• Message class: ISJP - Message class for invoice summary

• Message number: 602

• Message text: Line item is already included in Monthly Invoice &1 &2

What causes this issue?

You are trying to save changes in an accounting document which is
already included in Monthly Invoice &v1&

System Response

It is possible to save the changes of the baseline date or due date
depending on the settings in the IMG activity
<DS:SIMG.SIMG_CFORFBOBA5BELE>Change Message Control for Document
Processing</>.
Other changes different from baseline date or due date are not allowed.

How to fix this error?

Cancel the monthly invoice before you save the changes again.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ISJP602 - Line item is already included in Monthly Invoice &1 &2 ?

  The SAP error message ISJP602, which states "Line item is already included in Monthly Invoice &1 &2," typically occurs in the context of invoicing within the SAP system, particularly when dealing with monthly billing processes. This error indicates that the line item you are trying to include in a monthly invoice has already been processed and included in a previous invoice.
  Cause:
  
  Duplicate Processing: The line item has already been invoiced in a previous monthly invoice, and the system prevents it from being included again to avoid duplicate billing.
  Incorrect Invoice Selection: The user may be attempting to select an invoice that has already been finalized or posted.
  Data Entry Errors: There may be a mistake in the data entry process, leading to an attempt to re-invoice the same item.
  
  Solution:
  
  Check Previous Invoices: Review the previous monthly invoices to confirm whether the line item has already been included. You can do this by checking the invoice history for the relevant customer or project.
  Adjust Invoice Selection: If the line item is indeed already included, you will need to adjust your invoice selection to exclude that line item from the current invoice.
  Correct Data Entry: Ensure that the data being entered is accurate and that you are not mistakenly trying to invoice the same item again.
  Consult Documentation: Refer to SAP documentation or your organization's internal guidelines for handling invoicing issues to ensure compliance with procedures.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or a consultant who specializes in SAP invoicing processes for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VF01 (Create Invoice), VF02 (Change Invoice), and VF03 (Display Invoice) to navigate the invoicing process effectively.
  SAP Notes: Check SAP Notes for any known issues or patches related to invoicing that might address this error.
  User Training: Ensure that users involved in the invoicing process are adequately trained to minimize errors and understand the implications of duplicate invoicing.
  
  By following these steps, you should be able to identify the cause of the ISJP602 error and take appropriate action to resolve it.