diff --git a/fusion_plating/fusion_plating_certificates/__manifest__.py b/fusion_plating/fusion_plating_certificates/__manifest__.py
index 55376831..d4cd00a3 100644
--- a/fusion_plating/fusion_plating_certificates/__manifest__.py
+++ b/fusion_plating/fusion_plating_certificates/__manifest__.py
@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Certificates',
-    'version': '19.0.9.3.0',
+    'version': '19.0.10.0.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Certificate registry for CoC, thickness reports, and quality documents.',
     'description': """
diff --git a/fusion_plating/fusion_plating_jobs/__manifest__.py b/fusion_plating/fusion_plating_jobs/__manifest__.py
index 3b85656d..a9f0e729 100644
--- a/fusion_plating/fusion_plating_jobs/__manifest__.py
+++ b/fusion_plating/fusion_plating_jobs/__manifest__.py
@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Native Jobs',
-    'version': '19.0.12.1.6',
+    'version': '19.0.12.2.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Native plating job model — replaces mrp.production / mrp.workorder bridge.',
     'author': 'Nexa Systems Inc.',
diff --git a/fusion_plating/fusion_plating_jobs/migrations/19.0.12.2.0/post-migrate.py b/fusion_plating/fusion_plating_jobs/migrations/19.0.12.2.0/post-migrate.py
new file mode 100644
index 00000000..dd658edc
--- /dev/null
+++ b/fusion_plating/fusion_plating_jobs/migrations/19.0.12.2.0/post-migrate.py
@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+# Backfill one fp.certificate.part per existing certificate from its
+# legacy singular fields, so pre-existing certs render identically under
+# the new multi-part CoC. Lives in fusion_plating_jobs (not certificates)
+# because it reads x_fc_job_id, a jobs-module field; the part-line table
+# itself is created by the certificates upgrade, which runs first.
+import logging
+
+from odoo import api, SUPERUSER_ID
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    if 'fp.certificate.part' not in env:
+        return
+    certs = env['fp.certificate'].search([])
+    made = 0
+    for cert in certs:
+        if cert.part_line_ids:
+            continue
+        try:
+            pid = cert._fp_resolve_part_identity()   # (number, name, serials)
+        except Exception:
+            pid = ('', '', '')
+        job = cert.x_fc_job_id if 'x_fc_job_id' in cert._fields else False
+        part = job.part_catalog_id if (job and 'part_catalog_id' in job._fields) else False
+        try:
+            desc = cert._fp_resolve_customer_facing_description() or cert.process_description or ''
+        except Exception:
+            desc = cert.process_description or ''
+        spec = cert.customer_spec_id if 'customer_spec_id' in cert._fields else False
+        env['fp.certificate.part'].create({
+            'certificate_id': cert.id, 'sequence': 10,
+            'part_catalog_id': part.id if part else False,
+            'part_number': cert.part_number or (pid[0] or ''),
+            'part_name': pid[1] or '',
+            'description': desc,
+            'serial': pid[2] or '',
+            'customer_spec_id': spec.id if spec else False,
+            'spec_reference': cert.spec_reference or '',
+            'quantity_shipped': cert.quantity_shipped or 0,
+            'nc_quantity': cert.nc_quantity or 0,
+        })
+        made += 1
+    _logger.info('fp.certificate.part backfill: created %s part-line(s)', made)
diff --git a/fusion_plating/fusion_plating_reports/__manifest__.py b/fusion_plating/fusion_plating_reports/__manifest__.py
index 6ef00717..31d852ca 100644
--- a/fusion_plating/fusion_plating_reports/__manifest__.py
+++ b/fusion_plating/fusion_plating_reports/__manifest__.py
@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Reports',
-    'version': '19.0.11.34.0',
+    'version': '19.0.11.35.0',
     'category': 'Manufacturing/Plating',
     'summary': 'PDF reports for Fusion Plating: quote, SO, WO, packing, BoL, CoC, invoice, receipt, quality + compliance.',
     'depends': [