DM 41X: Doble integral using different modules fails

[rawi]

Thomas, thank you very much for your very helpful advice. Yes, this was the problem. Somehow I thought it is with the Advantage module which needs a certain number of registers but does not prohibit the use of certain registers. In the future I will read the instructions more carefully. Thank you as well for the tips to shorten the programs. I feel I could learn a lot from you.
Best
Raimund