A PROCEDURE REFERENCE statement causes the procedure referenced by a specified procedure reference variable to be executed as a procedure invocation.

<procedure reference statement>

──<procedure reference variable>─┬─────────────────────────┬───────────┤
                                 └─<actual parameter part>─┘

<procedure reference variable>

──┬─<procedure reference identifier>────┬──────────────────────────────┤
  └─<procedure reference array element>─┘