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My apologies for any language barriers.
It sounds like you are attempting to assign a ventilation air per person requirement to an area in the project.
Rooms (found in Architecture tab) do not typically carry this information - Rooms are mainly used for architecture-related parameters
Spaces (found in Analyze tab) can carry this information. The Space Type parameter brings up Space Type settings, which can be defined with a number of values, including ventilation air:
Unfortunately, this would mean having to transfer your UNI sheet values into this Space Type Settings format. This can be done manually, with some third-party addins, and with Dynamo. Once done, you would have this for any future projects as well.
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If you still want to use calculated parameters, you should know that you cannot check string text in Revit parameter formulas. So [if(Parameter="VALUE",A,B)] is not valid.