There is a mappable field called Start Event that is used to store this exact option. When this field is selected/mapped, it will store the GPI Trigger Name that you assigned when creating the trigger in the reader configuration area.
I think that would be what you are looking for in your question.
I already have that Field mapped to a database Field (Column Name: StartEvent - VarChar(255)). Every tag that gets scanned, I see "Management Studio Start/Stop Form" in that column instead of the GPI Trigger Name: "GPI-CheckOut".
I confirmed that no tags are getting scanned unless that GPI (motion sensor) gets tripped.
That does sound correct but could also depends on the configuration you are using to trigger that input. If you have an account rep with us, your best bet may be to contact them to see about sending over your config settings for us to review.