Amazon search term report "end date" definition

Hi,

I have downloaded the Amazon Search term report from the Amazon Advertising console. Now I am wondering what the column definition is for the column "end date". It should be obvious, but I think it is not. My guess would be that it is the date that Amazon has registered the last transaction for that row. It cannot be the same as the end date for the campaign, since in the report I am looking at there are a lot of different end dates for active campaigns.

Anyone here has a clue?

Thanks in advance!