Fix

booking.py

@@ -1119,10 +1119,12 @@ class Booking(Workflow, ModelSQL, ModelView):
             if self.total_amount:
                 print('total_amount...', self.total_amount, self.total_advances)
                 res = self.total_amount - (self.total_advances or 0)
+                if res > -1 and res < 1:
+                    res = 0
         elif name == 'pending_acco':
-            res = [fol.pending_accommodation for fol in self.lines]
+            res = sum(fol.pending_accommodation for fol in self.lines)
         elif name == 'pending_charges':
-            res = [fol.pending_charges for fol in self.lines]
+            res = sum(fol.pending_charges for fol in self.lines)
         return res
 
     def get_collect_amount(self, name):

folio.py

@@ -259,7 +259,7 @@ class Folio(ModelSQL, ModelView):
         res = 0
         if name == 'pending_accommodation':
             # if self.payment_status != 'paid':
-                res = self.get_total_accommodation()
+            res = self.get_total_accommodation()
         if name == 'pending_charges':
             total_charges = self.get_total_products()
             charge_paid = 0
@@ -362,7 +362,8 @@ class Folio(ModelSQL, ModelView):
         def _check_accommodation(folio):
             for charge in folio.charges:
                 if charge.status != 'paid':
-                    raise UserError(gettext('hotel.msg_accommodation_not_paid'))
+                    raise UserError(
+                        gettext('hotel.msg_accommodation_not_paid'))
 
         def _check_charges(folio):
             for charge in folio.charges:

message.xml

@@ -111,5 +111,8 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_can_not_change_departure">
             <field name="text">It can not change departure date because, it has charges of room in the new dates!</field>
         </record>
+        <record model="ir.message" id="msg_charges_not_paid">
+            <field name="text">There is charges not paid!</field>
+        </record>
     </data>
 </tryton>