minor fix assets party required

asset.py

@@ -6,14 +6,12 @@ from trytond.pool import PoolMeta
 class Asset(metaclass=PoolMeta):
     __name__ = 'account.asset'
 
-
     def get_move(self, line):
         move = super(Asset, self).get_move(line)
         Company = Pool().get('company.company')
         company = Company.search([])
         if move:
             for line in move.lines:
-                code = str(line.account.code)
-                if code.startswith("5"):
+                if line.account.kind == 'expense':
                     line.party = company[0].party
         return move