How To Fix >1606 - Function module not allowed to be called directly

>1606 - Overview

• Message type: E = Error

• Message class: >1 - Shockwave SAPGUI message handling

• Message number: 606

• Message text: Function module not allowed to be called directly

Self-Explanatory Message

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>1606 - Details

• The SAP error message "1606 Function module not allowed to be called directly" typically occurs when a function module is being invoked in a way that is not permitted by its design. This error is often related to the use of function modules that are intended to be called only by specific programs or through certain interfaces, rather than being called directly by users or other programs.
  
  Cause:
  
  Direct Invocation: The function module is being called directly in a way that is not allowed. Some function modules are designed to be called only by specific SAP programs or through certain transactions.
  Authorization Issues: The user may not have the necessary authorizations to call the function module.
  Incorrect Usage: The function module may require certain parameters or context that are not being provided when called directly.
  
  
  Solution:
  
  Check Documentation: Review the documentation for the function module to understand its intended use and any restrictions on direct calls.
  Use