Displaying a field from database and save it at the same time

Following scenario:

  1. User clicks on an item that he/ she is interested about.
  2. After that, dynamic pages is used to show the user more details about selected product.
  3. User clicks on „submit request“ and should land on other page, where the same item is displayed and he additionally fills out some information.

Goal : In the „submit request“, the page should contain the preselected item and additionally to fill out the form. User send the information, which is saved in Database.

Question : I can show the preselected item and I get the information from the form into the database. But I can’t see in the database which product user has selected.
Does anyone has an idea how to solve it?

Thank you very much…