The default is to Include all Source codes
1.Untick the check box to be able to select Source codes
2.Click onto the Constraints tab and then back onto Sources to refresh form
3.Right click in the Sources window
4.Select Add Source
5.Click on Yes to message confirming you wish to continue and you understand previous campaign history will be deleted
6.Click into each of the check boxes beside each Source code required
7.Click Select button to return. The ticked sources are inserted under the Sources tab.