Activity Chart Checks : (C4079) Data elements with incomplete type definition

(C4079) Data elements with incomplete type definition

Error In:
Completeness
Description:
There are data elements whose type definition is missing or incomplete.
Example:
Element X is defined within the chart A2. X is defined in terms of a user-defined type (UDT) T_X, where T_X has not been defined.
Erroneous Elements:
Events, conditions, data-items, and UDTs