[OpenERP-users] how to use _inherit to delete _sql_constraints

[forum-user]

Hello everyone,
      I have a question about account.py.
    
_sql_constraints = [
        ('credit_debit1', 'CHECK 
(credit*debit=0)',  'Wrong credit or debit value in model !'),
        ('credit_debit2', 'CHECK 
(credit+debit>=0)', 'Wrong credit or debit value in model !'),
    ]


I want to delete this code ,but I don`t want to delete it in origin file.I want 
to  create new  module to inheart it. But i don`t konw how to write code to 
delete a  _sql_constraints.
thank you very much
Joshua




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