Activity Chart Checks : (C4065) Elements that flow to/from generic instance but are not used as actual parameters

(C4065) Elements that flow to/from generic instance but are not used as actual parameters

Error In:
Completeness
Description:
There are elements that flow into or from an instance box of a generic chart, but are not declared as actual Input or Output parameters. Parameters must be defined.
Example:
In the following figure, the actual parameters P1 and S1 are shown as being input/output to the instance box in chart A2, but they have not been bound to the formal parameters in the properties.
Erroneous Elements:
Events, conditions, data-items, and fields