How To Fix SIPT018 - Enter a valid leading document type

SIPT018 - Overview

• Message type: E = Error

• Message class: SIPT - SIPT: Digital Signature Portugal

• Message number: 018

• Message text: Enter a valid leading document type

What causes this issue?

The system must check the validity of the combination of leading
document type and series to make sure the combination is consistent and
unique in the relevant company code. If you leave the leading document
type field empty, the system cannot perform the required checks.
Even if each combination of leading document type and series entered for
a company code seems to be consistent and unique, the system cannot
perform the required checks if the leading document type has not been
specified for any of the number range intervals in the relevant fiscal
year.

System Response

The system will prevent the posting of any invoices that use a number
range interval for which the combination of leading document type and
series is inconsistent or not unique in Customizing.

How to fix this error?

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

Procedure for System Administrators

Enter a valid combination of leading document type and series for the
relevant number range. Make sure you enter a value for the leading
document type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SIPT018 - Enter a valid leading document type ?

  The SAP error message SIPT018, which states "Enter a valid leading document type," typically occurs in the context of document processing within SAP, particularly when dealing with document types in the SAP system. This error indicates that the system is expecting a valid document type to be entered, but the input provided does not meet the criteria for a valid leading document type.
  
  Cause:
  
  Invalid Document Type: The document type entered does not exist in the system or is not configured correctly.
  
  Configuration Issues: The document type may not be assigned to the relevant transaction or may not be set up for the specific business process.
  User Input Error: The user may have mistyped the document type or selected an incorrect one from a dropdown list.
  Authorization Issues: The user may not have the necessary permissions to use the specified document type.
  
  
  Solution:
  
  Check Document Type: Verify that the document type you are trying to enter is