diff --git a/src/main/webapp/formdefinitions/poiForm.json b/src/main/webapp/formdefinitions/poiForm.json
index d795e4ef6dd3615d52550bbb93ad008d308b867b..fbb1808a68733ba8baf1a5cd91475f436da8881b 100755
--- a/src/main/webapp/formdefinitions/poiForm.json
+++ b/src/main/webapp/formdefinitions/poiForm.json
@@ -71,7 +71,9 @@
         {
             "name" : "userId",
             "dataType" : "INTEGER",
-            "required" : false
+            "fieldType" : "SELECT_SINGLE",
+            "required" : true,
+            "nullValue" : "-1"
         },
         {
             "name" : "externalResourceIdentifier",
diff --git a/src/main/webapp/formdefinitions/weatherStationForm.json b/src/main/webapp/formdefinitions/weatherStationForm.json
index ba42241810dcfc9bed499b9ba68a0b9a3284055a..1bc2f92be78d4c23f1a599bada42d9b7102684ba 100755
--- a/src/main/webapp/formdefinitions/weatherStationForm.json
+++ b/src/main/webapp/formdefinitions/weatherStationForm.json
@@ -77,7 +77,9 @@
         {
             "name" : "userId",
             "dataType" : "INTEGER",
-            "required" : false
+            "fieldType" : "SELECT_SINGLE",
+            "required" : true,
+            "nullValue" : "-1"
         },
         {
             "name" : "externalResourceIdentifier",