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res.partner.x_fc_default_coc_contact_id (single Many2one) becomes x_fc_default_coc_contact_ids (self-referential Many2many 'Default CoC Contacts') so a customer can list several contacts who need the CoC. - res.partner: M2m field (rel fp_default_coc_contact_rel) + many2many_tags. - Cert: contact_partner_id (primary addressee printed on the cert) is set to the FIRST CoC contact at job creation + lazy-filled at issue. - Send: action_send_to_customer pre-fills the email composer with ALL the customer's CoC contacts (primary + the rest), falling back to the company. - fp.job cert-default resolution + the action_issue gate wording updated. - Migration 19.0.10.2.0: copies each partner's old single value into the new M2m, then drops the orphaned column. Deployed + verified on entech: migration copied 2 existing values, old column dropped, field is M2m, send pre-fills all contacts. entech-only part_line_ids / multi-part resolver preserved. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>