Fix

booking.py

@@ -567,19 +567,19 @@ class Booking(Workflow, ModelSQL, ModelView):
 
         for charge in charges:
             bk = charge.folio.booking
-            invoice_party_id = fo.booking.party.id
+            invoice_party = fo.booking.party
             if charge.invoice_to:
-                invoice_party_id = charge.invoice_to.id
+                invoice_party = charge.invoice_to
 
             unit_price = bk.currency.round(charge.unit_price)
             if invoice_party_id not in res.keys():
-                res[invoice_party_id] = {
-                'party': invoice_party_id,
-                'currency': bk.currency.id,
-                'payment_term': None,
-                'number': bk.number,
-                'reference': charge.folio.registration_card,
-                'lines': [],
+                res[invoice_party.id] = {
+                    'party': invoice_party,
+                    'currency': bk.currency.id,
+                    'payment_term': None,
+                    'number': bk.number,
+                    'reference': charge.folio.registration_card,
+                    'lines': [],
                 }
 
             res[invoice_party_id]['lines'].append({