Activity Chart Checks : (C4073) Elements that are used by an activity but are neither input nor affected internally

(C4073) Elements that are used by an activity but are neither input nor affected internally

Error In:
Completeness
Description:
There are elements used in the mini-spec of an activity, but they are neither input nor affected (modified or generated) in the mini-spec.
Example:
In the figure, activity INST2 has the following mini-spec:

C and D/X=4;Y=2

 

 

D is not shown as an input to the chart and is not affected internally within the mini-spec; however, it is used by INST2.
.
 
Erroneous Elements:
Events, conditions, and data-items