I want to remove specific line record

@api.onchange('minus_value')
def on_change_minus_value(self): 

obj = self.customer_statement_wizard_line_ids.filtered(lambda x: x.amount_total < 0)

obj.unlink()

only this  line work but its delete all line......
self.customer_statement_wizard_line_ids = [(5, 0, 0)]

Not working

commands = [(2, line_id.id, False) for line_id in obj]