Forms persoalization: how to pass old and new values of same field to procedure

Hi All,

I have one requirement like below!

User will update the customer ship to location address while creating a sales order in sales order form.

for example :

customer ship to location : ABC  and site number : 1234 :before modification ,

after modifying the ship to location of the customer the newly created ship to location is DEF: and the site number is 5678.

My requirement is the newly created customer site 5678 must have all the  values same as 1234.

if we update in sales order form only new site is getting created it's contacts and other dff is not created.

With forms Personalization  iam calling a pl/sql package in to update the new site with the values of old site.