Hello, I have converted my traditional IRA to a Roth IRA. But the form 1099-R shows distribution code 7 (line 7). Is that ok, or should I ask for a new form?

It's okay, the code 7 is correct for the conversion to a Roth IRA and you have reached the age of 59 1/2.  If you are under the age of 59 1/2 there should be a code 2.