Activity Chart Checks : (C4050) The tested chart is a definition chart with empty top-level box

(C4050) The tested chart is a definition chart with empty top-level box

Error In:
Completeness
Description:
Either the tested chart is used as an off-page definition of an instance activity and has a single, empty, top-level activity; or, a single activity chart is tested that has a single, empty, top-level activity.
This check is performed only when you specify with definition charts. The error is reported in the definition chart.
Erroneous Elements:
The tested chart