Purchase Order 855 Acknowledgements

Good afternoon,

I was wondering what the intended functionality was for 855. We are running on 9.1

The issue that I am running into:

We have Acknowledgements coming back from the vendor with a pending price change, but when you view the schedule there is no difference between the different prices that they go through. These then go into Change Orders even though I can't tell any difference between the acknowledgment and the original PO.

Is every acknowledgment suppose to make a change order, even if there is no difference?

Thanks for you help,

-Justin