Hi, I use two repositories, in the project settings, in the jenkinsfile settings I do not interact with them in any way.  I have 
1st repo : ssh:xxxx/jenkins-file.git
2st repo : ssh:xxxx/source.git
Each of them has its own name, and then I pass it to git parametr. When I don't have second branch it's ok, but git parametr doesn't work, because it needs to have a branch in scm from which it takes names of branches. When I add second branch I get error "Lightweight checkout support not available, falling back to full checkout." and master node downloads own repository.