In the Microsoft "help" files (https://msdn.microsoft.com/en-us/library/hh510390.aspx) it states

A cross-domain rule that has definitive conditions will apply the rules logic to synonyms of the value in the conditions, as well the values themselves. The definitive conditions for the If and Then clauses are Value is equal to, Value is not equal to, Value is in, or Value is not in. For example, suppose that you have the following cross-domain rule for a composite domain: For City, if Value is equal to Los Angeles, then for State, Value is equal to CA. If Los Angeles and LA are synonyms, this rule will return correct for Los Angeles CA and LA CA and in error for Los Angeles WA and LA WA.

From what I read of that, if your input has "LA WA", you should receive a DQS error and not convert the result, is that correct? I have a cross-domain rule with

If <col1> value is equal to "abc" then <col2> value is equal to "xyz"

but what I am getting is for record where <col1> = "abc" and <col2> = "def", it is converting <col2> = "xyz"

Am I misunderstanding the help files or is this just a Microsoftism where the help files don't relate to the actual?