AH469479U001 is the printed circuit board used in the 890's fieldbus cards. This is not a part that can be ordered.
Different fieldbus cards are assembled into it with the sheet metal bracket. See picture.
Use the MODEL number that's on the sheet metal instead to order replacements. This model number will be different for the different fieldbus options.
In distributor extranet tool, they begin 8903 so if you type that in extranet and set qty 1, you can see the different versions listed.
This trick works for anything with static bill of materials (not configurables).
4/22jh