return code 2 from copy command

[fpefpe]

I was running a loop in a btm file to copy hundreds of files keeping track of the copy return code (%_?) --- I got a return code of 2 on a hand full of files, but it seems that the copy worked ---- as best as I can tell a return code of 2 means that there was "some other error" --- is there a way to track that down? Thanks