**As** an OpenProject user
**I want** to calculate custom field values based on other attribute fields
**so** that I can automatically calculate values.

Begin of the insertionExamples:End of the insertion Begin of the deletion Acceptance criteria:End of the deletion

* Begin of the insertionRICE score

End of the insertion Begin of the deletion Add option to a custom field (e.g. separate custom field type) to infer value from other attributes.
End of the deletion * Begin of the insertionRisk scoreEnd of the insertion Begin of the deletion Support basic operations:
* Addition, subtraction, multiplication, division
* Allow use of parentheses (or similar) to adjust the order of operation for addition/subtraction vs. multiplication/division

Out of scope:

* Exponentiation, median, variance, percentile, ...End of the deletion