Module Chart Checks : (C5011) Elements using uninitialized context variables

(C5011) Elements using uninitialized context variables

Error In:
Correctness
Description:
Elements contain action expressions that use an uninitialized context variable.
Example:
There is a transition labeled as follows:

E / Y:=$X; $X:=Z

$X is used before any value is assigned to it.
Erroneous Elements:
Actions