DTML (1/25/2015)
My apologies Hugo - it appears the ANSI_NULL_DEFAULT was not at all the problem - it was the fact that I had a previous MYTABLE in my system which I created as having myid as a PK!!
Thanks for getting back to this, DTML! I was convinced that there had to be some logical explanation for what you witnessed. I am very glad that you found this explanation, and shared it with us.
Well done! 😉