This tab is available in the property sheet of data structure columns, inputs and data query executions.
The Data Structure Source Objects tab lists the source objects to which the object is attached. In general, this tab is automatically propagated and read-only, but you can add or delete source objects for data structure columns belonging to the following steps:
In this tab, you can also click the Edit Source Expression tool, in the lower part of the dialog box, to open the Source Expression Editor, and specify a more complex source expression using functions.
You can also add or delete source objects for the following steps:
Inputs (see Data Inputs (ILM)) – source objects correspond to objects of source data stores linked to a database, an XML document, a web service or a flat file.
Data query executions (see Inserting a data query execution) – source objects originate from the previous steps to which data query executions are linked.