Is there an adjective that describes something that must be omitted/absent in a particular context?
For example, consider this software documentation that explains the relationship between two different variables:
contentType = 'application/json',
schemaVersionis required (must be present).
contentType = 'x-vendor/manifest',
schemaVersionis optional (may be present or absent).
contentType = 'image/jpeg',
schemaVersionis _______ (must be absent).
What word can be used to fill in the blank?