I have Customized sales in sale module I have added my fields in sale.sale and also some field in sale.line by inherit sale module of tryton
While saving sales in sale i got the following error : field = cls._fields[fname] KeyError: 'sequence' also attached snapshot of error message <https://lh4.googleusercontent.com/-Jx8-6KFougM/VQlTpeK9cPI/AAAAAAAAAFc/OsqX_mJAzjk/s1600/KeyError%3A%27Sequence%27.png>
