DLookUp

yes

try something like
[R-sætninger]=Forms![F-CHO-kemi]![R-sæt1] AND [R-sæt2] = .....

the last parameter of the dlookup is similar to the WHERE clause in an SQL but without "WHERE"

Jeg kan ikke rigtig gemmenskue fuldførelsen af formlen, vil du skriv den?

shouldnt give me points until you have received an answer you can use :o)

R-sætninger]=Forms![F-CHO-kemi]![R-sæt1] AND [R-sæt2]= Forms![F-CHO-kemi]![R-sæt1]

This is NOT tested because I dont know the names of the table fields! and I dont know if it is ALL kontrolelementer which can be = R-sætninger] if this is the case then you should use OR instead of AND