Activity Chart Checks : (C4058) Elements that flow from/to instance without a matching flow in definition chart

(C4058) Elements that flow from/to instance without a matching flow in definition chart

Error In:
Completeness
Description:
There are elements that flow from or to the instance activity without matching flow-lines to or from an external activity in the off-page definition chart. Note that the elements flowing on flow-lines are matched, not the sources or targets of the flow.
This check is performed only when you specify with definition charts. The error is reported in the instance chart.
Example:
In the following figure, C is an input to the instance @A2. In the off-page definition chart A2, there is no matching flow from an external activity.
Erroneous Elements:
Events, conditions, data-items, information-flows, and fields