Pete,
I guess I found my mistake. It is working now. What I have done:
I copied the mous macro of the working one for the 737-300 to the new one called 737-400. In the fsuipc.ini file it was the last one in the [macro] part. I checked it with the TAB key and it worked. But it did not work with the button. As it was the last one in was not in the alphanumerical order and it seems to me that that was my fault. After deleting all macros in the ini file of the FSUIPC I restarted the FS 9 and redirected all buttons to existing macros. That did make the change in the FSUIPC.ini, where now the macros apear in alphanumerical order.
The best thing is, that it workes.
Thanks a lot for your supply. I really love your tool. From my point of view it is the best addon to the flight simulator and you do offer the best support I have seen on all the addons I own.
Best regards
Martin
p.s. sorry for my not very professional English