Account tax required

This module adds an option "tax policy" on account types. You have the choice between 3 policies : always, never and optional.

For example, if you want to have an tax account on all your expenses, set the policy to "always" for the account type "expense" ; then, if you try to save an account move line with an account of type "expense" without tax account, you will get an error message.

This module is based on the account analytic required module by Akretion.