diff --git a/shacl/dev-daemmung.ttl b/shacl/dev-daemmung.ttl
index 95b9deb..e134502 100644
--- a/shacl/dev-daemmung.ttl
+++ b/shacl/dev-daemmung.ttl
@@ -3,6 +3,14 @@
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 
+ff:MainPersonShape a sh:NodeShape ;
+    sh:targetClass ff:Citizen ;
+    sh:property [
+        sh:path ff:hasIncomeBrutto ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+    ] .
+
 ff:CitizenOwnsHouseShape
     a sh:NodeShape ;
     sh:targetClass ff:Citizen ;
diff --git a/shacl/dev-kindergeld.ttl b/shacl/dev-kindergeld.ttl
index d113e64..973b16d 100644
--- a/shacl/dev-kindergeld.ttl
+++ b/shacl/dev-kindergeld.ttl
@@ -3,6 +3,19 @@
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 
+ff:MainPersonShape a sh:NodeShape ;
+    sh:targetClass ff:Citizen ;
+    sh:property [
+        sh:path ff:hasIncomeBrutto ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+    ] ;
+    sh:property [
+        sh:path ff:hasIncomeNetto ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+    ] .
+
 ff:ChildAllowanceEligibilityShape
     a sh:NodeShape ;
     sh:targetClass ff:Citizen ;