Hello HW3,
thank you, so now i left out the minor bugfix completely, and installed the AOTD-AA-Ship-Schleuse-Bugfix instead. Thanks to BBW!
If i now want to enable the GWX 2.1 merged campaign it says the files "Campaign_RND.mis" and "Campaign_SCR.mis" have "already been altered by the AOTD-AA-Ship-Schleuse-Bugfix."
I take it this is what is intended for enabling the merged campaign, and thus ok ... If i'm right you do not need to answer

Thanks and greetings,
Catfish