Activity Chart Checks : (C3073) Actual binding whose data-type is not global

(C3073) Actual binding whose data-type is not global

Error In:
Correctness
Description:
Data-items, used as actual bindings in an instance box, are defined to be of some User-Defined Type (UDT), but the UDT is not global. It is defined in some chart, not in a GDS. Because this UDT is not visible to the generic chart, a formal parameter cannot have this type.
Note: UDTs are normally defined in a GDS.
Erroneous Elements:
Data-items