Hi Gopal,
Party is mostly used for B2B scenarios, i.e. when you want to describe in your scenario the business or company.
"Usually represents a company unit that is to be involved and addressed in message exchange."
You can check link below:
Communication Party - SAP XI: Design and Configuration Time - SAP Library
Configuring B2B Integration - SAP NetWeaver Process Integration - SAP Library
Can we map a business system to a party? As per PI documentation, Party is used for B2B scenario and for non SLD systems. Therefore only business components should be mapped to Party. Is this correct?
-- Business systems are technical systems which are maintained in our SLD . Business components are external systems out of our landscape , that's why it is always correct to map them with Party.
Rgds,