Statechart Checks : (C15006) Multiple events, that are ‘Task Event’, with the same ‘Its Task’ and the same ‘Event Mask’

(C15006) Multiple events, that are ‘Task Event’, with the same ‘Its Task’ and the same
‘Event Mask’

There is more than one Event that are defined as “Task Event” in their Design-Attributes, and have the same value in their “Event Mask” Design-Attribute.
Error In:
Design
Erroneous Elements:
Events