unable to delete the freeTextInvoice after submitting and when we recall

hi All,

when i am submitting FreeTextInvoice for customer I made sum mistache so i want to recall and when i am

Recalling i want to delete freetextInvoice. but here problem is i am unable to delete the freeTextInvoice,

now i am running the tutorial_Worflowprocessor form, is there any another way to do it.

it means to get the time to recall and delete the freeTextInvoie After submiting.