Always state Manglik status honestly (Yes / No / As per horoscope). Kundlis are checked eventually, and transparency builds mutual trust from day one.
If matching happens in your community, mention it. Simple as that.
Hiding manglik status helps nobody. The kundli reaches a pandit sooner or later, it comes out, and then the family feels you hid something. That is a bad start for a rishta that might otherwise have worked out.
Write it plainly: Manglik: Yes, or Manglik: No. If you genuinely do not know, write 'As per horoscope' instead of guessing.
Manglik: No (or 'Manglik: Yes' / 'Manglik: As per Janam Kundli')
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