Hi there,
in LibreOffice Calc I can add the following function to the menu, but I do not know what it does and neither searching the Internet nor trying in Calc was successful:
AutoFill Data Series: automatic /
.uno:AutoFill / FID_FILL_AUTO / 2655
Can anybody help me out?
Only after my first post I discovered that I can also ask in English. I deleted the first question in German.
Why do you want to add it to the menu if you don’t know what it does? 
Anyway, it should be the same as menu Sheet → Fill Cells → Fill Series… Series Type AutoFill, so select a cell range starting with one or more values and apply the command. See also online help.
I thought it would be something like that and it would be very useful for me, hence the question. Unfortunately it doesn’t work like you suggested, I tried every possibility I could think of but it always did nothing.
It’s not working for me either. When I click on this command (AutoFill Data Series: automatic) button it does nothing.
Libreoffice version: 7.3.7.2.