diff --git a/ALG/ALG_TAB.SRC b/ALG/ALG_TAB.SRC
index 3f3c20d4..37d3ae87 100644
--- a/ALG/ALG_TAB.SRC
+++ b/ALG/ALG_TAB.SRC
@@ -252,6 +252,10 @@ CREATE_TABLE(alg_terreinsector,0)
 --    prs_perslid_key_verantw2
 --        NUMBER(10)
 --        CONSTRAINT alg_r_prs_perslid_key4 REFERENCES prs_perslid(prs_perslid_key),
+-- in MLD_TAB.SRC:
+--    mld_dienstniveau_key
+--        NUMBER(10)
+--        REFERENCES mld_dienstniveau(mld_dienstniveau_key) ON DELETE SET NULL,
     CONSTRAINT alg_u_alg_terreinsector_upper UNIQUE(alg_locatie_key, alg_terreinsector_upper, alg_terreinsector_verwijder)
 );
 
diff --git a/MLD/MLD_TAB.SRC b/MLD/MLD_TAB.SRC
index efecb09d..f68c8312 100644
--- a/MLD/MLD_TAB.SRC
+++ b/MLD/MLD_TAB.SRC
@@ -1942,6 +1942,9 @@ ALTER TABLE alg_gebouw
 ALTER TABLE alg_locatie
     ADD mld_dienstniveau_key NUMBER(10)
     REFERENCES mld_dienstniveau(mld_dienstniveau_key) ON DELETE SET NULL;
+ALTER TABLE alg_terreinsector
+    ADD mld_dienstniveau_key NUMBER(10)
+    REFERENCES mld_dienstniveau(mld_dienstniveau_key) ON DELETE SET NULL;
 
 REGISTERONCE('$Id$')
 
diff --git a/_UP/DB52to53.src b/_UP/DB52to53.src
index aebee7de..1e0d017a 100644
--- a/_UP/DB52to53.src
+++ b/_UP/DB52to53.src
@@ -16,6 +16,11 @@ DEF_FAC_SRTNOT('AFDDEL', 0, 'lcl_noti_AFDDEL', 'prs/prs_afdeling.asp?key=',
 /////////////////////////////////////////////////////////////////////////////////////////// YAXX#89674
 ALTER TABLE mld_typeopdr ADD mld_typeopdr_afronden NUMBER(1) DEFAULT(1) NOT NULL;
 
+/////////////////////////////////////////////////////////////////////////////////////////// FMHN#87779
+ALTER TABLE alg_terreinsector
+  ADD mld_dienstniveau_key NUMBER(10)
+  REFERENCES mld_dienstniveau(mld_dienstniveau_key) ON DELETE SET NULL;
+
 /////////////////////////////////////////////////////////////////////////////////////////// FCLT#00000
 
 REGISTERONCE('$Id$')