We use URL source codes/UTM codes to track which campaign/segment/medium donations come in from. This is successful in regular/non-org. transactions and available in the "Source" field of transaction reporting, however, organization gifts 'lose' the souce and is not reportable. I submitted a ticket with Blackbaud support to confirm this, with the following response:

Our internal team reviewed this issue and it appears that this would be a feature request to expand the types of interactions that can capture the source code. A regular donation captures the interaction source. The organization donation is a different type of interaction and does not capture the interaction source.