Check the format of the REXX program and make sure that you have permission to execute the program. Make sure that you specified the name with letters in the correct case (upper or lower). If you specified a relative name, check that the program can be found with the PATH environment variable used to exec the REXX program.

When an external subroutine or function is called, you may see the IRX0043I (routine not found) message. Make sure that the subroutine name is quoted if it contains lowercase or special characters.