Miscellaneous Charges - Part of Asset

We created a Purchase order with miscellaneous charges, we then created two vouchers - a regular voucher, and a third party voucher. When interfacing with AM, we would like the miscellaneous charges (the third party voucher) to be part of the asset. I have tried testing this but the miscellaneous charges did not come over as part of the asset. We were able to assign an asset ID to both vouchers at the PO receipt level, but is there a way to make it come over to AM as part of the asset?