Form Personalization - PO form

Hi All,

I have requirement in PO to capture the change order quantity at line level DFF through personalization.

Example:

I have PO line 1 with Quantity as 100 initially and approved. Then business reduces the quantity to 90. I want to capture the difference quantity i.e. in one of attributes at PO line level. How can can we achieve this?

Thanks,

Sreedhar