How to determine all users below an org unit

[Shoaib Mirza]

Hi
 
I'm trying to find a way to read all users below an organisational unit, including users in sub-organisational units below the top org unit.
I found a function module which reads one org unit (SWI_GET_USERS_OF_ORG_UNIT), but I don' t know how to read for all org units/positions below a top level org unit.
 
Any advice would be appreciated.
 
Thanks 		 	   		  
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