X   WORKING-STORAGE SECTION.
 X   01 anA USAGE OBJECT REFERENCE A.
 X   01 aB  USAGE OBJECT REFERENCE B.
 X   01 aC  USAGE OBJECT REFERENCE C.
 X     .
 X     .
 X     .
 X   PROCEDURE DIVISION
 X   INVOKE anX "METHOD-1" USING BY REFERENCE anA.
 X                               BY VALUE     aB.
 X                         RETURNING          aC.
 X   CLASS-ID. X.
 X     .
 X     .
 X     .
 X   METHOD-ID. METHOD-1.
 X     .
 X     .
 X     .
 X   LINKAGE SECTION.
 X   01 aP  USAGE OBJECT REFERENCE P.
 X   01 aQ  USAGE OBJECT REFERENCE Q.
 X   01 anR USAGE OBJECT REFERENCE R.
 X     .
 X     .
 X     .
 X   PROCEDURE DIVISION USING BY REFERENCE aP
 X                            BY VALUE     aQ
 X                      RETURNING         anR.

• X Class P and class A must be the same class.
• X Class Q must be the same class or a parent of B.
• X Class R must be the same class or a subclass of C.

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