IW51 Create Task for Service Order

Hi,

I want to create a task in IW51 so that a Service Order(IW31) is created, I gone into SPRO :

-> plant maintenance and customer service

-> maintenance and service processing

-> maintenance and service notification

-> notification processing

-> additional function

-> define action box

Can someone tell me what FM I should use to create a Service Order(IW31) currently this is shown as

This FM creates a Sales Order I want to change this to change this to create a Service Order(IW31)

thanks