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What is the best place to implement custom function like substraction of two field values of a fact in BRMS 6 ?

Solution Unverified - Updated 2016-12-19T15:11:12+00:00 -

Issue

When choosing formula in modifying constraints for fact, what is the best way to implement following function?
e.g. User needs to calculate the difference between 2 integer numbers. The condition can be written as if (a-b)>5 . Where a and b are integer fields of the same fact.
What is the best practice to do implement it? Should users write a function for that or there are built-in sum/average/count etc. functions?

Environment

Red Hat JBoss BRMS (BRMS)
- 6.3.0

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