Filter limits One2Many to root records only to fix tree double-display

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/trade_finance/facility.py

@@ -101,7 +101,7 @@ class Facility(ModelSQL, ModelView):
         depends=['is_tpa'])
 
     limits = fields.One2Many('trade_finance.facility_limit', 'facility',
-        'Limits')
+        'Limits', domain=[('parent', '=', None)])
     currencies = fields.One2Many('trade_finance.facility_currency', 'facility',
         'Accepted Currencies')
     caps = fields.One2Many('trade_finance.facility_cap', 'facility', 'Caps')