The Transport Dependency Check (TDC) is a little tool that helps you to find related Business Warehouse transports with the same objects on it and are not imported yet to your production system. So you can find dependencies and make sure you will consider all necessary transport requests. This tool helps you to reduce the time to find all necessary transport requests.
The tool is writen in SAP ABAP and packed as a package with abapGIT.
This makes it a lot easier if you a in a project with several other people and if you don't know if there are any open transport request.