Interesting, in the past I've had the manufacturer require an in-person meeting at the facilities (which is basically their way of fact checking I guess) before coming through but for components never had them require a PO first.
On a funny/related note back when I worked at Google and was looking into compressing air during windy periods and then feeding it back through compressed air motors for energy and cooling, I tried to get specs and pricing from MTI, the French company that Tata Motors was said to be buying their motors from. In spite of being from Google and offering up the possibility of a very press worthy installation they wouldn't even give me the time of day. I figured they didn't actually have anything at that point and since Tata didn't ship their car for several years I continue to hold that belief. (I don't even know if Tata ever shipped their car, one option was buying cars and just taking out the engine)
On a funny/related note back when I worked at Google and was looking into compressing air during windy periods and then feeding it back through compressed air motors for energy and cooling, I tried to get specs and pricing from MTI, the French company that Tata Motors was said to be buying their motors from. In spite of being from Google and offering up the possibility of a very press worthy installation they wouldn't even give me the time of day. I figured they didn't actually have anything at that point and since Tata didn't ship their car for several years I continue to hold that belief. (I don't even know if Tata ever shipped their car, one option was buying cars and just taking out the engine)