Hi,
Business system
It is a logical system from a business point of view.
One or more logical systems that belong together from a business point of view is called a group of Business system group. A business system group represents a unit within a company or organization that can be defined according to legal, economic, administrative or geographic factors.
The objects in a business system group are uniquely identified by a uniform numbering system.
Business service
Its a third party system.
All these belong to a Business Scenario which is description of the flow of business processes according to a business typology. A business scenario represents a template for a business process, which runs within a particular area of a company process. All processes required to completely process the task are listed in chronological order in the scenario. Business scenarios can be described graphically, in either aggregated or detailed form (EPC). Example: Direct sale to industrial recipient
Business system
http://help.sap.com/saphelp_nw04/helpdata/en/7b/d4653fd1d3b81ae10000000a114084/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/7d/6b82cd0d1aef48ab5953524c9cc5b2/frameset.htm
Bussiness Service link
http://help.sap.com/saphelp_nw2004s/helpdata/en/c7/301640033ae569e10000000a155106/frameset.htm
Hope this will help you.
Regards
Aashish Sinha
PS : reward points if helpful
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