WHAT IS THE USE OF FUNCTION IMPORT(EXECUTE ACTION)?

Hi All!

I am a beginner and new to SAP ABAP!

I just came across a concept called function imports and after a little research i came to know that it is used when a scenario doesn't fall under standard CRUD operations.

can someone please give a scenario that doesn't fall under standard CRUD operation so that i can understand that as a beginner!

NOTE: please don't give too in depth examples like release of sales order etc!

Thanks in advance!