I tried the alcobj command as you suggested Sam.
Apparently it only works for database files.
Perusing apis now..... . . .

Cannot allocate or deallocate DRP540FM in library MRPRODO.
Additional Message Information

Message ID . . . . . . : CPF0984 Severity . . . . . . . : 30
Message type . . . . . : Diagnostic
Date sent . . . . . . : 01/28/19 Time sent . . . . . . : 13:07:01

Message . . . . : Cannot allocate or deallocate DRP540FM in library
Cause . . . . . : The user specified a file for allocation or
which is not a data base file. Only data base files can be allocated or


< snip>
Off the top of my head...

Maybe ALCOBJ *EXCL and if it fails it is in use. (Don't forget to DLCOBJ
if it succeeds.)

Or maybe the APIs on object locking may be needed.

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