This was an Entity Framework issue, one many have already had.
Not every time, but some times, when updating the model, StoredGenereatedPattern being droped in a section.
http://www.ladislavmrnka.com/2011/03/the-bug-in-storegeneratedpattern-fixed-in-vs-2010-sp1/
When looking at fixes, did not understand that BOTH SSDL and CSDL parts stored in same text. So look in upper part that it has StoredGenereated Pattern.