Surprisingly soon, I encountered the same situation when delivery between two streams. Same condition, same error message. I canceled the delivery and tried another approach.
This time, instead of merging the Srv directory using ccadmin account on UNIX, I renamed the src.jtest folder to src.ctest foler first before I started the merge again. Everything worked fine, no complain about the permision, no error message. The only window popped up was to manually merge the Srv directory.I think this is a bug of ClearCase when merging a directory with renamed elements.