Business Service
Used with business services (such as Projected Asset Cache), the Business Service source type allows you to invoke a business service to populate one or more variables, and to populate a child property set of the current row. The following figure shows the Business Service source type.

Using the Business Service source type, you can populate multiple variables or child variable maps in a single method invocation. This is possible if the variables are invoking the same business service and method with the same inputs. This consolidated call to the business service can happen regardless of the number of variables (that is, Property Set, another one, or a mix of two) needing to be populated.
For details on how to populate multiple variables or child variable maps in a consolidated call to the business service, see Using the Business Service Source Type to Populate Variables.