It is ADP, additional dealer profit. When I purchased my Kubota, it was called a documentation fee. Either way it is the same thing.
The local dealer also does other things, you order a part as they do not stock very much at all, they charge you freight, even if it is a regular order. They also use a sliding scale to mark up parts a percentage over the suggested retail price, easy to do with the computers.
I have solved the problem by ordering a parts book from one of the dealers on this forum and will be ordering the parts there. If I am going to be paying the freight, might as well come right to the front door.
The local dealer does not stock much anyway, have not seen more than one L model there at a time and a couple of the other smaller models.