ZGOCALLOUTIN, ZGOTO level 0 with entry ref not valid when using call-ins

Call in/Run Time Error: Code invoked by a call-in contained a ZGOTO 0:entryref. The purpose of a ZGOTO 0:entryref is to "refresh" the GT.M routine context, but that action would invalidate the interface with the calling (in) code.

Action: Refactor the code invoked by the call-in to avoid or appropriately conditionalize the ZGOTO 0:entryref.

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