We're getting duplicate mappings for CamSiS inst id to Lookup inst id for "CL" and "ED". The actual issue is incorrect data in jackdaw table is getting populated to inst-mapping API.
This is a hack to the sync tool that in addition to providing a warning of these duplicates also swaps behaviour to use the first (correct College mapping) instead of the latter (Classics and Education) mapping.
So a workaround until source data is corrected, but with a worthwhile warning added.
Part of #4 (closed)