Cases When Function Modules Need Adjustment 

Function modules can be enhanced by means of enhancements to the parameter interface at implicit enhancement options.

The following changes to function modules make them eligible for adjustment:

●      A new importing parameter was declared that has the same name as an importing parameter introduced by an enhancement.

●      An enhanced function module was deleted.

●      An enhanced function module was moved to another function group.

●      An enhanced function module is not RFC-compatible.

More information:

Adjusting Classes, Interfaces, Web Dynpro Components and Function Groups