Activity Chart Checks : (C3129) Activities that contain sub-activities with the same name

(C3129) Activities that contain sub-activities with the same name

Error In:
Correctness
Description:
Activities contain subactivities with the same name, via transparent activities.
Example:
As shown in the following figure, the top-level activity TOP contains subactivities A2 and A3. A3 is defined within its property as being transparent. The definition chart A3 also contains a subactivity A2. The error is generated because activity TOP effectively contains two subactivities with the same name (because A3 is transparent).
Erroneous Elements:
Activities