>Do not rely on functions like recno() and deleted() when there are more than one table in the query.

What about RECNO("kartei") or when a specific alias is specified. Does it work then?

SELECT kartei.* , RECNO("kartei") as satznr, kunden.vorname, ;
                  ^^^^^^^^^^^^^^^
        kunden.name1, kunden.name2, kunden.name3, kunden.strasse, ;
        kunden.plz, kunden.ort ;
    FROM kartei ;
        INNER JOIN kunden ON kartei.kundennr == kunden.kundennr ;
    WHERE       kartei.vormerker ;
        AND     kartei.nummer == this.cIsbn ;
        AND NOT DELETED() ;
    ORDER BY best_dat DESC ;
    INTO CURSOR myvormerker READWRITE