Show latest of two records

Hi
I want to show the user their records and give the possibility to update the fields.

Say there are five fields in the form and all five at filled out the first time. But the second time the user submits the form, he only fills out the first two.

If I use: [cfdb-value form=”contact form” show=”field1,field2,field3,field4,field5″ limit=”1″ filter=”Submitted Login=$user_login” orderby=”submit_time DESC”]
The user will see his own records – but ONLY if he fills out all five every time.

Making the fields mandatory is not an option.