It frequently happens that a Tour Operator concerned to integrate the services offered by a system TOWeRS in its structure, has previously had the opportunity to interface via Web Service with another external booking engine - let's call it WS - and has already mapped its codes.
In case the TOWeRS system had already an interface with that same WS, you could create a translation table - at least limited to the structures and characteristics found in WS - which significantly reduces the development time and data entry required to map codes between the two systems.
A meeting with the technical staff will succeed in finding useful shortcuts to speed up the integration between the two systems.