I am selling my car- the buyers bank wants me sign a limited power of attorney when we make the sale. why?

I am not sure what this form is, and what it means.. or why I have to sign it?
I know I would typically fill out a bill of sale form.
Can anyone explain.
I live in Wisconsin if that makes any difference.
And it is going to be notorized (sp) so I am sure it is a legit document since I am meeting them at the bank and signing it right before I am given the money and sign the title.

It is legit…It is so they can sign anything that needs to be signed in reference to that title…Just make sure it says on it that it is in reference to that particular vehicle,and it includes the VIN #…

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