I get $F$12
I had to change";" to "," but I'm guessing that's just a regional variation?
I get $F$12 from that formula, and from
=ADDRESS(ROUND(ROW(F7);-1)+2;COLUMN(F7))
I have a suspicion that you have only provided us with part of your formula, and not the part that is producing the error.
What is the rest of it?
=IF(A$1="Gesamtergebnis";$A6-$AB6;IF(B$1="Gesamtergebnis";SUM($B6:$AA6);IF(ISTNV(INDEX('GS Auswertung - 1'!$A$2:$AC$200;MATCH($A6;'GS Auswertung - 1'!$A$2:$A$200;0)+1;COLUMN(B$1)+1));IF(ROUND(PRODUCT(INDIRECT(ADDRESS(FLOOR(ROW(B6)/10;0)*10+2;COLUMN(B6)));$A6);0)<>0;ROUND(PRODUCT(INDIRECT(ADDRESS(FLOOR(ROW(B6)/10;0)*10+2;COLUMN(B6)));$A6);0);"");INDEX('GS Auswertung - 1'!$A$2:$AC$200;MATCH($A6;'GS Auswertung - 1'!$A$2:$A$200;0)+1;COLUMN(B$1)+1))))