How To Fix P99B020 - The interface of function module '&1' is incompatible to formtype '&2'

P99B020 - Overview

• Message type: E = Error

• Message class: P99B - Payroll Versions Basis

• Message number: 020

• Message text: The interface of function module '&1' is incompatible to formtype '&2'

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message P99B020 - The interface of function module '&1' is incompatible to formtype '&2' ?

  The SAP error message P99B020 indicates that there is an incompatibility between the interface of a function module and the form type being used. This typically occurs when the function module is expected to have a certain structure or parameters that do not match what is defined in the form type.
  
  Cause:
  
  Mismatch in Parameters: The function module may have been changed (e.g., parameters added, removed, or modified) after the form type was created or used.
  Incorrect Form Type: The form type being called may not be compatible with the function module due to versioning or design changes.
  
  Configuration Issues: There may be configuration settings that are not aligned with the expected parameters of the function module.
  
  
  Solution:
  
  
  Check Function Module Definition: Review the definition of the function module (&1) to ensure that its parameters match what is expected by the form type (&2). You can do this by navigating to the function module in transaction