How To Fix SIPT018 - Enter a valid leading document type

SAP Error Message - Details

• 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 valid. You can do this by checking the configuration in the relevant SAP module (e.g., FI, MM, SD).
  Configuration Review: Ensure that the document type is properly configured in the system. This can be done by navigating to the configuration settings for the relevant module and checking the document type settings.
  Correct Input: If the document type was entered manually, double-check for any typos or errors. If using a dropdown, ensure the correct option is selected.
  Authorization Check: Ensure that the user has the necessary authorizations to use the document type. This may require coordination with your SAP security team.
  Consult Documentation: Refer to SAP documentation or help resources for specific details on valid document types for the transaction you are working with.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using transaction codes like FB01 (for financial documents), ME21N (for purchase orders), etc.
  SAP Notes: Check SAP Notes for any known issues or patches related to the document type error.
  User Training: Ensure that users are trained on the correct document types and their usage within the system to minimize input errors.
  Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to resolve the SIPT018 error and continue with your document processing in SAP.