Hi Trent,

It looks like this column hasn't been exposed at the query level, though as you've observed it's in the back-end database. If exposed, this column would show up on the SpecimenEvent table (viewable via the vial 'history' links and in the schema browser). Would you like me to enter a request to expose this column? If you'd like to expose it yourself in the meantime, you can add the following line to SpecimenEventTable.java:
     addWrapColumn(_rootTable.getColumn("ExternalId")).setHidden(true);

Note that the 'setHidden(true)' call just prevents the column from appearing by default in various UIs.

Thanks,
Britt