Fix typo in intrastat_declaration when cancelling moves

Closes #14331

modules/account_stock_eu/stock.py

@@ -231,7 +231,7 @@ class Move(metaclass=PoolMeta):
             'account.stock.eu.intrastat.declaration')
         super().cancel(moves)
         declarations = {
-            m.declaration for m in moves if m.intrastat_declaration}
+            m.intrastat_declaration for m in moves if m.intrastat_declaration}
         if declarations:
             IntrastatDeclaration.open(
                 IntrastatDeclaration.browse(declarations))

modules/account_stock_eu/tests/scenario_account_stock_eu_arrival.rst

@@ -375,3 +375,13 @@ Export declaration as fallback::
     ...     b'arrival,FR,2,9403 10 51,15.0,750.00,21,5.0,,\r\n')
     >>> export.form.filename.endswith('.csv')
     True
+
+Cancelling the shipment reopens the declaration::
+
+    >>> shipment.click('cancel')
+    >>> shipment.state
+    'cancelled'
+
+    >>> declaration.reload()
+    >>> declaration.state
+    'opened'

modules/account_stock_eu/tests/scenario_account_stock_eu_dispatch.rst

@@ -386,3 +386,13 @@ Export declaration as fallback::
     ...     if intrastat_extended else
     ...     b'dispatch,FR,2,9403 10 51,60.0,1800.00,12,20.0,CN,\r\n'
     ...     b'dispatch,FR,2,9403 10 51,15.0,750.00,21,5.0,CN,FR40303265045\r\n')
+
+Cancelling the shipment reopens the declaration::
+
+    >>> shipment.click('cancel')
+    >>> shipment.state
+    'cancelled'
+
+    >>> declaration.reload()
+    >>> declaration.state
+    'opened'