Mysterious spare part found inside dishwasher after using it

Hello community!

I was using my SIEMENS Sn26m230 dishwasher this morning and after washing I've found a mysterious spare part inside it. It was found on top of the plates in the lower basket.

However, I've checked the dishwasher and I can't really find a place where to fit it back… The part itself is made of light plastic while everything inside dishwasher is made of dark grey plastic. I'm quite sure that it's from inside the dishwasher because i'm the only one using it and I didn't wash anything which can fit such a part.

Here is how it looks:

https://yadi.sk/i/8mit3HKj3LbQnW

https://yadi.sk/i/WgqmVJeq3LbQo4

Could anyone give me a clue about this part? What does it do? Where from does it come? Any ideas?

So many unanswered questions so I can't even fall asleep…