'Post-process this form element and perform the related
transactions. This method will be called after the main
form has been accepted, where the master record ID will
be provided.
@param form: the form
@param master_id: the master record ID
@param format: the data format extension
@return: True on success, False on error'

def accept(self, form, master_id=None, format=None):

    return True
