Hi Anil,
PM02 & 03, both are external procurement But the major difference is incase of PM02 there is no services tabstrip for the particular operation.
That means PM03, services procured through service entry sheet. Whereas in case of PM02 ctrl key service and or material procured through normal PR & PO cycle.
Here service is in the form of service material, created through MMS1 and not AC01.
Regards,
VINOD.V