OTM Shipment cost rounding errors when attempting to truncate

Summary:

We use rate factors to determine the sell shipment cost for a fuel surcharge accessorial. The fuel cost is a % of Shipment Cost Type = Base. The rate factor is picking the right % to use for the multiplier, but I am having an issue with OTM and rounding functions. The requirement is to truncate the fuel surcharge cost at 3 decimal places, and then round it to 2 decimal places. I am able to do the rounding outside of OTM, but the truncation is not working when generating the bill xml. If I use the Rounding Type (at