[10.0][FIX] prevent assigning parner with default ref

account_bank_statement_import_camt/models/__init__.py

@@ -3,3 +3,5 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 from . import parser
 from . import account_bank_statement_import
+from . import bank_statement
+from . import account_bank_statement_line

account_bank_statement_import_camt/models/account_bank_statement_line.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from odoo import api, models
+
+
+class AccountBankStatementLine(models.Model):
+
+    _inherit = "account.bank.statement.line"
+
+    @api.multi
+    def write(self, vals):
+        """
+        Purpose of this hook is catch updates for records with name == '/'
+        
+        In reconciliation_widget_preprocess, there is attempt to assign
+        partner into statement line, this assignment relies on name,
+        during import name setup to '/' for records without it
+        and this makes search results wrong and partner assignment randomly
+        """
+        recordset = self
+        if self.env.context.get('no_reassign_empty_ref'):
+            for rec in self:
+                if (len(vals.keys()) == 1 and 'partner_id' in vals 
+                    and rec.name == '/'
+                ):
+                    recordset -= rec
+            return super(AccountBankStatementLine, recordset).write(vals)
+        return super(AccountBankStatementLine, self).write(vals)

account_bank_statement_import_camt/models/bank_statement.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from odoo import api, models
+
+
+class AccountBankStatement(models.Model):
+
+    _inherit = "account.bank.statement"
+
+    @api.multi
+    def reconciliation_widget_preprocess(self):
+        return super(AccountBankStatement, self.with_context(
+            no_reassign_empty_ref=True)).reconciliation_widget_preprocess()