We have two countrywide address encoding systems that encode the address as a strict hierarchy, but both fail to encode the legal address of one of our customer

We have two countrywide address encoding systems that encode the address as a strict hierarchy, but both fail to encode the legal address of one of our customers, which is something like "1500m down the dirt road starting at the 27th km of the TownFoo-TownBar road". No house number, no street name, no town name.