Stream is a subset of data based on the ‘IN’ condition. Streaming enables users to run executable tasks for the selected set of values for one or several columns of the source. 

Modify Model task inherits Streams from the original model setup that is displayed on the Existing Stream Keys pane of the Streams Tab when you select a model for modification (Fig.). 

Streams tab allows you to set up additional stream keys. The system WILL NOT allow you to modify the existing stream keys. 

Please refer to the Data Model Editor section for more information about streams and their setup.