Costa Rica Signup TAX Number

It seems that during the registration process if you select Costa Rica as a Country of reference it allows only to add a NITE (That is for people who dont have a residence in the country and are not Costa Rican).

For TAX purpose in costa rica there are 3 type of accepted ID number. Cedula (National ID Number) DIMEX (Legal Resident Number) And NITE (People that need to do a tax purpose but are not legal resident nor national).
Here is an explanation of this:

The portal seems to accept only NITE. Is there a reason for this?

Thank you