In bug 308253 has been implemented the ability to display a field value based on the value of another field. Unfortunately, we cannot display a field value based on multiple values of another field, which is a bit too restrictive, leaving us with the "all the time" or "only once" choices. This request is similar to bug 479400, but for field values, not fields themselves.

I have to say, that restriction for displaying a field value based on the value of another is almost unusable due to restriction for just one value with restriction for unique field values. Let me explain why: In bugzilla we have several products. We added custom field "fixed_in_version" which should contain version of product which will fix reported problem. Each product have different version and therefore we set visibility of values based on product. But when 2 products have same versions it is not possible, that same values are displayed for our custom field for both products. Possible solutions: 1) allow set visibility based on multiple values in dependent field (change relationship 1:N to M:N) 2) change unique key from value to complex key value,visibility_value_id (this also leads to referencing edited values not just by value) There is also other problem with editing custom fields values. When you are editing legal values via editvalues.cgi?field=XXX it is not clear, when are values displayed. You have to open each value to check when it is displayed.