How to restrict multiple form submissions in Oracle Responsys?

Hi Team,

I tried using lookup and passing PET / Suppl record field values in form link and fetch the updated field values in the form url in the emails. But when the customer opens the same link and try to submit the data, it will consider as a fresh form submission. To restrict this, I am trying to fetch the already submitted values to the form document using data lookup as shown below.

<p>RIID:$RIID_$ </p>

<p>offer:$CHOICE_OF_OFFER$</p>

<p>Email: $EMAIL_ADDRESS_$</p>

<p>Lookup RIID:$lookup(RIID_)$ </p>

<p>Lookup Email: $lookup(EMAIL_ADDRESS_)$</p>