An SAP Business Object in Avantra corresponds to SAP Business Objects BI Installation. It must be linked to a standalone Database in Avantra which is set up to monitor the CMS database.
A Business Service is a cross-System (and even a cross-Customer) Composite Check. In other words, while the input Checks of a Composite Check have to be executed on the System the Composite Check is defined for, a Business Service can have arbitrary input Checks.
And although every Business Service is “owned” by a Customer, it may have input Checks from other Customers as well. The input Checks for a Business Service can be: a built-in Check, a Custom Check, a Composite Check, a System Status, or another Business Service. Business Services also record Availability Data.
An example for a Business Service would be, for example, to correlate all SystemAlive Checks of all productive SAP Systems. A Business Service is a Managed Object as well as a Check, therefore you can apply, for example, Maintenance Windows to it. And of course a Business Service has a Check Status.