1 decision table that has 4 input columns and 1 output column, in one instance the output column is derived based on only 3 input columns, in a second instance the output column is derived based on 4 input columns.
Is it possible to model this with only one decision table?
Yes. You can define in the first rows conditions for 4 input values and later for three Input values.
Please remark that in BRFplus a column can contain value ranges as well as expressions.
Best Regards,
Tobias