Activity and Module Chart Relation Checks : (C7403) Elements that flow in the activity chart without corresponding flow in the module chart

(C7403) Elements that flow in the activity chart without corresponding flow in the module chart

Error in:
Correctness
Description:
Data elements are specified as flowing between activities in the activity-chart, but they do not flow between the corresponding modules in the module chart.
Example:
In the following figure, assume that A1 is implemented by M1 and A2 is implemented by M2. X flows between A1 and A2 in the activity-chart. X will be detected as an erroneous element because it does not flow between the modules that implement A1 and A2.
Erroneous Elements:
Events, conditions, data-items, and information-flows