Unable to change Charm Project

Hello

We have some charm documents that functional team wants to move from one project to another Charm project. For some Charm documents project was changed successfully. But for some we are getting error  " Unable to change project due to non-imported transport of copies" But when i checked TOCs they were successfully imported. I checked SLG1 and did not find any errors for these transports. What else can i check

Thanks

Murali