CA Ideal passes the address of each data item in the CALL statement. When the CA Ideal subprogram refers to a parameter, whether as a source or target, the subprogram is actually referring directly to the corresponding data item in the calling program.
Since CA Ideal controls the entire runtime environment, any attempt to modify the value of an update parameter that corresponds to a data item that was named in the CALL statement as an input data item results in a runtime error.
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