Activity Chart Checks : (C3003) Aliases defined as non variable or non bit-array

(C3003) Aliases defined as non variable or non bit-array

Error In:
Correctness
Description:
Aliases, illegally defined because of the element appearing in the definition of the alias, are defined as non-variable (compound or constant) or non-bit-array.
Example:
X2 is a single bit-array from 1 to 14, defined in chart TOP. X2_INIT is a single integer, with usage of Alias, defined in chart TOP to be X2(2). The error occurs on data-item X2_INIT.
Erroneous Elements:
Data-items