Activity Chart Checks : (C4061) Elements that are input to an activity and output of another activity without a flow-line between the two activities

(C4061) Elements that are input to an activity and output of another activity without a flow-line between the two activities

Error In:
Completeness
Description:
There are elements that flow on separate flow-lines.
If an activity that is a source of one flow-line changes the value of the element and this value is used by a target activity of the other flow-line, the drawing might be misleading.
Example:
In Figure a, X is changed by activity A and is used by D, but there is no flow-line between A and D. Therefore, an error is generated.
However, the separate flow-lines in Figure b are allowed because they have the same source. Therefore, no error is generated.
Erroneous Elements:
Events, conditions, data-items, information-flows, and fields