UPS Label References

As of right now there is a carrier-level limitation within the UPS API that causes custom fields 2 and 3 to be merged when the data is sent. This creates a problem for invoice reconciliation because when our system scrapes the UPS invoices for our references, it's not able to find a match. The only workaround currently is to use only reference fields 1 and 2. This limits or ability to add special packing instructions on the labels for our warehouse team. It would be wonderful if all three reference lines could be passed to UPS individually.