IGZ0173S There was an invalid attempt to start a sort or merge.

Explanation
 A sort or merge initiated by a COBOL program
was already in progress when another sort or merge was attempted by
another COBOL program.
Only one sort or merge can be active at a time.

System action
 The application was terminated.

Programmer response
 Change the application so that it does
not initiate another sort or merge from within the COBOL sort
exists.

Symbolic Feedback Code
 IGZ05D