You're right that the term barasa is often connected with the number twelve in Jain usage, but the specific idea of “barasa” referring to 1200 grantha units is not a standard, universally accepted Jain canonical meaning.

• In most Jain contexts, barasa (baras) commonly denotes the number twelve (e.g., twelve months, twelvefold classifications, etc.).
• The notion of a unit like “grantha” (a manuscript/engraved-verse unit) being grouped into 1200-per-barasa is not a canonical or widely attested Jain standard across Digambar and Shwetambar traditions. If a particular author or school uses barasa to mean 1200 grantha, that would be a sect- or text-specific interpretation rather than a general Jain doctrine.

If you have a specific text or passage in mind, share it and I can explain how that tradition understands barasa in that context, staying within authentic Jain interpretations.