Activity Chart Checks : (C4119) Activities with attribute TRANSPARENT_LEVEL set to ON which are not instances of an off-page activity chart

(C4119) Activities with attribute TRANSPARENT_LEVEL set to ON which are not instances of an off-page activity chart

Error In:
Completeness
Description:
Activities contain an attribute named TRANSPARENT_LEVEL that is set to ON when there are not instances of an off-page activity chart.
Note: Check Model does not report on top-level activities of transparent activities.
Example:
The following chart contains an activity A3, which has an attribute called TRANSPARENT_LEVEL set to ON. However, A3 is not decomposed onto an off-page chart (no @ symbol); therefore, the warning is generated.
Erroneous Elements:
Activities