I have sold coupons from an equity savings account (OST) to a friend and later bought them back to a book-entry account (AOT). Nordnet (NN) informed me that they must be purchased at the “correct price.” I couldn’t find information anywhere on what the correct price was.
So, I sold and bought them at a slightly higher price, and my friend received a small compensation for helping me move them out of the equity savings account.
I had to provide deeds of sale and copies of account statements and wire transfers to NN for both transactions. I lost a bit of money, but I got rid of the problem.