Cause
This error occurs if the scale factor of a Decimal variable is negative. In the definition of a Decimal variable, the precision is the first value within the brackets ([]) and the scale factor is the second.
The following code fragment shows this error.
vars
d: Decimal[12, -4]; // error: negative scale factor not valid
Action
Change the scale factor to an integer value in the range 1 through 23, not greater than the precision.