diff --git a/src-modules/module/costage/hilfstabellen/costage_st_studien_aggr_fuellen.sql b/src-modules/module/costage/hilfstabellen/costage_st_studien_aggr_fuellen.sql
index 973fb42..f9cfdc4 100644
--- a/src-modules/module/costage/hilfstabellen/costage_st_studien_aggr_fuellen.sql
+++ b/src-modules/module/costage/hilfstabellen/costage_st_studien_aggr_fuellen.sql
@@ -218,7 +218,11 @@ select st_studium_nr,
         (case when studiengangs_typ_kb='TSG' then st_absz_nr else st_studium_nr end ))+1
         end)
  as studiengang_nr,
-       fach_nr,
+        (case when primaerflag =1 then 1
+       else 
+       dense_rank () over (partition by semester, st_studstamm_nr,studiengang_nr  
+       order by fach_nr)+1
+        end) as fach_nr,
        unikey,
        beginn_datum as anfdat,
       (case when studienstatustyp not in ('Z','X') then null::date