Output file is not created in the appl directory if X12MsgInTestName has a path like b/TESTMAP

Output file is not created in the appl directory for Inbound translations if X12MsgInTestName (network filename in the inbound tab) has a path like b/TESTMAP.  Just TESTMAP is good enough because the sysappl path is automatically attached.
You will typically get error messages like these:

1      Executing: Copy from b/TESTMAP.SessionNo, to :appl\b/TESTMAP.SessionNo
163   EXEC Error On: otpack.exe b/TESTMAP.SessionNo archive\_b/TESTMAP.SessionNo