Use first description of statement lines as description of move line without origin

Closes #14038

modules/account_statement/account.py

@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.i18n import gettext
-from trytond.model import ModelView, dualmethod
+from trytond.model import ModelView, dualmethod, fields
 from trytond.modules.account.exceptions import PostError
 from trytond.pool import Pool, PoolMeta
 
@@ -18,6 +18,9 @@ class Journal(metaclass=PoolMeta):
 class Move(metaclass=PoolMeta):
     __name__ = 'account.move'
 
+    statement_lines = fields.One2Many(
+        'account.statement.line', 'move', "Statement Lines", readonly=True)
+
     @classmethod
     def _get_origin(cls):
         return super()._get_origin() + ['account.statement']
@@ -36,6 +39,12 @@ class Move(metaclass=PoolMeta):
                         statement=move.origin.rec_name))
         super().post(moves)
 
+    @classmethod
+    def copy(cls, moves, default=None):
+        default = default.copy() if default is not None else {}
+        default.setdefault('statement_lines')
+        return super().copy(moves, default=default)
+
 
 class MoveLine(metaclass=PoolMeta):
     __name__ = 'account.move.line'
@@ -43,3 +52,28 @@ class MoveLine(metaclass=PoolMeta):
     @classmethod
     def _get_origin(cls):
         return super()._get_origin() + ['account.statement.line']
+
+    @fields.depends('move', '_parent_move.statement_lines')
+    def on_change_with_description_used(self, name=None):
+        description = super().on_change_with_description_used(name=name)
+        if (not description
+                and self.move
+                and getattr(self.move, 'statement_lines', None)):
+            for statement_line in self.move.statement_lines:
+                if statement_line.description:
+                    description = statement_line.description
+                    break
+        return description
+
+    @classmethod
+    def search_description_used(cls, name, clause):
+        operator = clause[1]
+        if operator.startswith('!') or operator.startswith('not '):
+            bool_op = 'AND'
+        else:
+            bool_op = 'OR'
+        domain = [bool_op,
+            super().search_description_used(name, clause),
+            ('move.statement_lines.description', *clause[1:]),
+            ]
+        return domain

modules/account_statement/tests/scenario_account_statement.rst

@@ -250,12 +250,12 @@ Test posted moves::
     >>> statement_line = statement.lines[0]
     >>> move = statement_line.move
     >>> sorted((l.description_used or '' for l in move.lines))
-    ['', 'description', 'other description']
+    ['description', 'description', 'other description']
 
     >>> statement_line = statement.lines[2]
     >>> move = statement_line.move
     >>> sorted((l.description_used or '' for l in move.lines))
-    ['', 'description']
+    ['description', 'description']
 
 Test invoice state::