True position tolerance to a face 1

[Picklefactory]

Hello folks
Hope I'm OK posting same question in multiple forums, I'm new to this one and was recommended to post here rather than my original choice.
OK, my question-
We have shiny new designer in the company, who is producing drawings with faces toleranced by true position back to other datums/planes. I'm perfectly familiar with true position of holes, but I've never come across this style of tolerancing a face. I don't understand how a face can be toleranced in this way, am I thick, or is my new designer nuts?
I hope that makes sense.
Here is a sketch (If I've managed to load it correctly) where there are 2 faces toleranced as true position. One is the end face of a valve feature, where there is a threaded cap assembled up to the face, and the other is a milled face on the right hand side to accommodate the two ports drilled through. Both are toleranced back to a fictional plane. Does that make sense in this context?
Cheers

 

[ewh]

It's all part of the learning process, and he will survive the better for it. While I really hated it at the time, I am very grateful for all of the bloody drawings and designs that the checker kicked back for correction. Even the seemingly mundane corrections have helped me to better define design intent.

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]

 

[KENAT]

Here here ewh. I used to dread getting my drawings checked but also new how much I learnt from it.

KENAT, probably the least qualified checker you'll ever meet...