Conditional field mapping always returning true

[HeleneSh]

If the condition returns false, the entire field (e.g. "Medical Surgical") should not be mapped and be ignored. 

The value 33.CustomAnswers:Portfolio is Diabetes, so it should return false and ignore the entire mapping.

Whatever I try, Fusion keeps returning this:

Invalid Parameter: MMI Medical Surgical OU value "Diabetes"

But the mapping just needs to be ignored as it's a conditional field in Workfront too. 

[HeleneSh]

PS: the value of 33.CustomAnswers: Operating Unit is also Diabetes