Dear Mr.Lan.Yumul. You need to change the agreement to the profession what you are applying for.
Example if you want to change your profession to draftsman, you need to sign the agreement of draftsman. The previous agreement which you have signed for Engineer doesn't work. And I suggest you to apply with draftsman instead of Engineer and don't you wait and waste the time in attempting the UPD as it is much difficult to get passed. I am sure to get passed in UPD need luck. haha

Don't be underestimated and try to get pass.

Thank you