Hi, i want to change the domain filter of a existing field. e.g. in class stock_move in file: addons/stock/stock.py

'product_id': fields.many2one('product.product', 'Product', required=True, select=True, domain=[('state','<>','obsolete')],states={'done': [('readonly', True)]}), 

I want to write a new module for that, which overwrites the existing column with the new domain. How can I do this?