Invoke a form(with data) from a workflow notification

I am trying to-

"Invoke a form(with data) from a workflow notification"

For example, there will be a link in the PO approval notification. Once the user clicks that lick the form will open up with the same PO details already queried in it.

To achieve this I have already tried this approach:

1) In the form function, I have added one parameter named XX_PO_NUM

2) In the workflow, I have created a new 'Form' type attribute with default value: PO_FUNC:XX_PO_NUM=12345 (where PO_FUNC is the short name of my PO form)

3) Added a form personalization in the same PO form, to just accept the parameter which was passed from the workflow notification