COBEC0050I <opt> is not valid in CALL on mainframe

The <opt> keyword in the CALL statement is a Micro Focus extension which will be invalid on the mainframe. It is accepted and supported in the MCOv3 system.
Restriction: This topic applies only when the Enterprise Server feature is enabled.
System Action:
The CALL statement is processed and generated normally.
Resolution:
If mainframe compatibility is desired, the CALL statement source should be modified to avoid Micro Focus extensions.
Module:
cicsprep (dfhxc2pc)
Destination:
Source Listing, .TRL file, STDOUT