[FIX] account: aged receivable

- Create an invoice of 10000 at date 2016-11-30, due 2017-02-28
- Make a partial payment of 1500 at date 2016-11-09
- Make a partial payment of 1000 at date 2016-11-30
- Make a partial payment of 2000 at date 2017-01-30

At current date (e.g. 2017-04-04), run the Aged Partner Balance. 5500 is
still due, but set to the +120 days period instead of 30-60.

opw-725890

addons/account/report/account_aged_partner_balance.py

@@ -178,9 +178,20 @@ class aged_trial_report(report_sxw.rml_parse, common_report_header):
             partners_amount = dict((i[0],0) for i in partners_partial)
             for partner_info in partners_partial:
                 if partner_info[2]:
-                    # in case of partial reconciliation, we want to keep the left amount in the oldest period
-                    self.cr.execute('''SELECT MIN(COALESCE(date_maturity,date)) FROM account_move_line WHERE reconcile_partial_id = %s''', (partner_info[2],))
+                    # in case of partial reconciliation, we want to keep the remaining amount in the
+                    # period corresponding to the maturity date of the invoice.
+                    self.cr.execute('''
+                        SELECT MAX(COALESCE(l.date_maturity, l.date))
+                        FROM account_move_line AS l
+                        JOIN account_account AS a ON l.account_id = a.id
+                        WHERE reconcile_partial_id = %s
+                            AND a.type IN %s
+                        ''', (partner_info[2], tuple(self.ACCOUNT_TYPE),))
                     date = self.cr.fetchall()
+                    # Just in case date is not defined (but it should be defined)
+                    if date and not date[0][0]:
+                        self.cr.execute('''SELECT MIN(COALESCE(date_maturity,date)) FROM account_move_line WHERE reconcile_partial_id = %s''', (partner_info[2],))
+                        date = self.cr.fetchall()
                     partial = False
                     if 'BETWEEN' in dates_query:
                         partial = date and args_list[-3] <= date[0][0] <= args_list[-2]