Activity Chart Checks : (C3121) Elements containing a truth table with illegal combination of outputs

(C3121) Elements containing a truth table with illegal combination of outputs

Error In:
Correctness
Description:
Elements described by truth tables use the same element twice as an output, via aliases.
Note: This check ensures that the same element is not used twice as a whole. The check does not compare overlapping of slices.
Example:
The following figure shows the truth table definition for activity ACT_1. CO_2 is defined to be an integer. AL_CO_2 is defined to be an alias of CO_2. An error is generated because CO_2 is the same as AL_CO_2.
Erroneous Elements:
Subroutines, actions, and activities