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 f9cfdc4..7f37ec4 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
@@ -133,6 +133,7 @@ where SG.st_studiengang_nr=tmp_studien2.st_studiengang_nr_msg
 and ST.st_studium_nr=SA.st_studium_nr
 and ST.st_studstamm_nr=tmp_studien2.st_studstamm_nr
 and SA.st_sem_nr=tmp_studien2.st_sem_nr
+and SA.gueltig_ab=tmp_studien2.gueltig_ab
 and tmp_studien2.studiengangs_typ_kb ='TSG'
 ;