diff --git a/ui/hv2-ui/src/app/data-objects.ts b/ui/hv2-ui/src/app/data-objects.ts
index 5d658f1..7eafd46 100644
--- a/ui/hv2-ui/src/app/data-objects.ts
+++ b/ui/hv2-ui/src/app/data-objects.ts
@@ -10,6 +10,10 @@ export interface Account {
     id: number
     description: string
 }
+export const NULL_Account: Account = {
+    id: 0
+    ,description:   ''
+}
 
 export interface Tenant {
     id: number
@@ -26,6 +30,21 @@ export interface Tenant {
     iban: string
     account: number
 }
+export const NULL_Tenant: Tenant = {
+    id: 0
+    ,salutation:   ''
+    ,firstname:   ''
+    ,lastname:   ''
+    ,address1:   ''
+    ,address2:   ''
+    ,address3:   ''
+    ,zip:   ''
+    ,city:   ''
+    ,phone1:   ''
+    ,phone2:   ''
+    ,iban:   ''
+    ,account:   0
+}
 
 export interface Premise {
     id: number
@@ -34,6 +53,13 @@ export interface Premise {
     zip: string
     city: string
 }
+export const NULL_Premise: Premise = {
+    id: 0
+    ,description:   ''
+    ,street:   ''
+    ,zip:   ''
+    ,city:   ''
+}
 
 export interface Flat {
     id: number
@@ -42,6 +68,13 @@ export interface Flat {
     area: number
     flat_no: number
 }
+export const NULL_Flat: Flat = {
+    id: 0
+    ,description:   ''
+    ,premise:   0
+    ,area:   0
+    ,flat_no:   0
+}
 
 export interface OverheadAdvance {
     id: number
@@ -50,24 +83,46 @@ export interface OverheadAdvance {
     startdate: string
     enddate: string
 }
+export const NULL_OverheadAdvance: OverheadAdvance = {
+    id: 0
+    ,description:   ''
+    ,amount:   0
+    ,startdate:   ''
+    ,enddate:   ''
+}
 
 export interface OverheadAdvanceFlatMapping {
     id: number
     overhead_advance: number
     flat: number
 }
+export const NULL_OverheadAdvanceFlatMapping: OverheadAdvanceFlatMapping = {
+    id: 0
+    ,overhead_advance:   0
+    ,flat:   0
+}
 
 export interface Parking {
     id: number
     description: string
     premise: number
 }
+export const NULL_Parking: Parking = {
+    id: 0
+    ,description:   ''
+    ,premise:   0
+}
 
 export interface CommercialPremise {
     id: number
     description: string
     premise: number
 }
+export const NULL_CommercialPremise: CommercialPremise = {
+    id: 0
+    ,description:   ''
+    ,premise:   0
+}
 
 export interface Tenancy {
     id: number
@@ -79,6 +134,16 @@ export interface Tenancy {
     startdate: string
     enddate: string
 }
+export const NULL_Tenancy: Tenancy = {
+    id: 0
+    ,description:   ''
+    ,tenant:   0
+    ,flat:   0
+    ,parking:   0
+    ,commercial_premise:   0
+    ,startdate:   ''
+    ,enddate:   ''
+}
 
 export interface Fee {
     id: number
@@ -88,12 +153,25 @@ export interface Fee {
     startdate: string
     enddate: string
 }
+export const NULL_Fee: Fee = {
+    id: 0
+    ,description:   ''
+    ,amount:   0
+    ,fee_type:   ''
+    ,startdate:   ''
+    ,enddate:   ''
+}
 
 export interface TenancyFeeMapping {
     id: number
     tenancy: number
     fee: number
 }
+export const NULL_TenancyFeeMapping: TenancyFeeMapping = {
+    id: 0
+    ,tenancy:   0
+    ,fee:   0
+}
 
 export interface AccountEntry {
     id: number
@@ -102,5 +180,12 @@ export interface AccountEntry {
     created_at: string
     amount: number
 }
+export const NULL_AccountEntry: AccountEntry = {
+    id: 0
+    ,description:   ''
+    ,account:   0
+    ,created_at:   ''
+    ,amount:   0
+}
 
 
diff --git a/ui/hv2-ui/src/app/data-objects.ts.tmpl b/ui/hv2-ui/src/app/data-objects.ts.tmpl
index 2608ed5..425cd80 100644
--- a/ui/hv2-ui/src/app/data-objects.ts.tmpl
+++ b/ui/hv2-ui/src/app/data-objects.ts.tmpl
@@ -9,6 +9,17 @@ export interface $JsNameConverter($table.name) {
     ${column.name}: ${column.jstype}
 #end for
 }
+export const NULL_$JsNameConverter($table.name): $JsNameConverter($table.name) = {
+    id: 0
+#for $column in $table.columns
+    ,${column.name}: #slurp
+#if $column.jstype == "string"
+  ''
+#else if $column.jstype == "number"
+  0
+#end if
+#end for
+}
 
 #end for