How To Fix 11388 - An invoice already exists for this entry sheet

SAP Error Message - Details

• Message type: E = Error

• Message class: 11 - External Services Management

• Message number: 388

• Message text: An invoice already exists for this entry sheet

What causes this issue?

An invoice has already been posted for this entry sheet. Please note
that the service specifications - and thus the value of the entry sheet
- cannot therefore be changed.

System Response

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

How to fix this error?

Before the services recorded in the entry sheet can be changed, the
invoice must be cancelled.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 11388 - An invoice already exists for this entry sheet ?

  The SAP error message 11388, "An invoice already exists for this entry sheet," typically occurs in the context of invoice verification or when processing invoices against purchase orders or entry sheets. This error indicates that there is already an invoice recorded in the system for the specific entry sheet you are trying to process.
  Cause:
  
  Duplicate Invoice Entry: The most common cause is that an invoice has already been created for the entry sheet you are trying to invoice against.
  Incorrect Entry Sheet: You may be trying to create an invoice for an entry sheet that has already been invoiced.
  System Configuration: There may be settings in the system that prevent multiple invoices from being created for the same entry sheet.
  
  Solution:
  
  
  Check Existing Invoices: Verify if an invoice has already been created for the entry sheet in question. You can do this by checking the invoice documents or using transaction codes like MIRO (Invoice Verification) or MRBR (Release Blocked Invoices).
  
  
  Review Entry Sheet: Ensure that you are referencing the correct entry sheet. If you are trying to create a new invoice, confirm that it corresponds to a valid and un-invoiced entry sheet.
  
  
  Use Different Entry Sheet: If the entry sheet has already been invoiced, you will need to use a different entry sheet for your new invoice.
  
  
  Consult with Colleagues: If you are unsure whether an invoice has been created, consult with your colleagues or the finance department to confirm the status of the entry sheet.
  
  
  System Configuration: If you believe this is an error in the system configuration, you may need to consult with your SAP administrator or technical team to review the settings related to invoice processing.
  
  
  Related Information:
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  MIRO: For invoice verification.
  MIR4: To display invoices.
  ME23N: To display purchase orders and related documents.
  
  
  
  Documentation: Review SAP documentation or help files related to invoice processing and entry sheets for more detailed guidance.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  
  
  User Training: Ensure that users involved in invoice processing are trained on the correct procedures to avoid duplicate entries.
  
  
  By following these steps, you should be able to resolve the error and proceed with your invoice processing in SAP.