Activity Chart Checks : (C4063) Actual parameters not flowing to/from generic instance

(C4063) Actual parameters not flowing to/from generic instance

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