Allow to unload all ULs.

This commit refs #14035

load.py

@@ -101,8 +101,6 @@ class LoadOrder(metaclass=PoolMeta):
             'pending_uls': 'You have loaded less ULs (%s) than expected (%s).',
             'sale_confirmed': 'Cannot force loading ULs because sale "%s" is '
                 'confirmed.',
-            'unload_cancel': 'Cannot force unloading all ULs. Load order "%s" '
-                'must be cancelled completely.',
             'no_uls': 'Load order "%s" must have some UL to be finished.'
         })
 
@@ -271,9 +269,6 @@ class LoadOrder(metaclass=PoolMeta):
             if self.sale.state not in ('draft', 'quotation'):
                 self.raise_user_error('sale_confirmed', self.sale.rec_name)
 
-        if not _add and len(uls) == len(self.unit_loads):
-            self.raise_user_error('unload_cancel', self.rec_name)
-
         keyfunc = partial(self._group_sale_line_key, uls)
         items = sorted(uls, key=keyfunc)
         for key, grouped_items in groupby(items, key=keyfunc):
@@ -349,8 +344,11 @@ class LoadOrder(metaclass=PoolMeta):
     def _update_sale_line(self, sale_line, items, _add=True):
         _sign = 1 if _add else -1
         sale_line.ul_quantity += _sign * len(items)
-        sale_line.quantity += _sign * sum(sale_line.unit.compute_qty(
-                item.uom, item.quantity, sale_line.unit) for item in items)
+        sale_line.cases_quantity += sum(item.cases_quantity for item in items)
+        sale_line.quantity += _sign * sale_line.unit.round(
+            sum(sale_line.unit.compute_qty(item.uom, item.quantity,
+                sale_line.unit) for item in items))
+        return True
 
     def _get_items(self):
         return self.unit_loads

locale/es.po

@@ -42,12 +42,6 @@ msgstr ""
 "No puede forzar la carga de UdCs porque la Venta asociada \"%s\" está "
 "confirmada."
 
-msgctxt "error:carrier.load.order:"
-msgid ""
-"Cannot force unloading all ULs. Load order \"%s\" must be cancelled "
-"completely."
-msgstr "No puede descargar todas las UdCs de la Orden \"%s\". Debe volver a iniciarse."
-
 msgctxt "error:carrier.load.order:"
 msgid "Load order \"%s\" must have some UL to be finished."
 msgstr "La Orden de carga \"%s\" debe contener alguna UdC para poder finalizarse."