Contact form 7 validation

Hi, i create a contact form 7 with invoice type selected, but i realize when i only insert my email adress in the form and leave all others fields empty and i confirm the form the form throw me a error (fine) because i didn’t fill all the required field but the (user) and the (invoice) are create !!! WHY ? How can i fix that ? Can i do something to do if i don’t want to create a user and the invoice until the form is totally comfirm.