Activity Chart Checks : (C4069) Formal parameters not appearing on external flow-lines

(C4069) Formal parameters not appearing on external flow-lines

Error In:
Completeness
Description:
There are elements declared as In or Out parameters of a generic activity chart, but they do not flow into or out of the top-level activity to an external box in the generic chart.
Erroneous Elements:
Events, conditions, and data-items