1 files changed, 26 insertions, 20 deletions

diff --git a/packages/merchant-backoffice-ui/src/paths/instance/templates/update/UpdatePage.tsx b/packages/merchant-backoffice-ui/src/paths/instance/templates/update/UpdatePage.tsx
index eedb77f28..32c5637aa 100644
--- a/packages/merchant-backoffice-ui/src/paths/instance/templates/update/UpdatePage.tsx
+++ b/packages/merchant-backoffice-ui/src/paths/instance/templates/update/UpdatePage.tsx
@@ -51,7 +51,7 @@ type Entity = {
   description?: string;
   otpId?: string | null;
   summary?: string;
-  amount?: AmountString;
+  amount?: string;
   minimum_age?: number;
   pay_duration?: Duration;
   summary_editable?: boolean;
@@ -68,7 +68,7 @@ interface Props {
 export function UpdatePage({ template, onUpdate, onBack }: Props): VNode {
   const { i18n } = useTranslationContext();
   const { config } = useSessionContext();
-  const {state:session} = useSessionContext();
+  const { state: session } = useSessionContext();
 
   const [state, setState] = useState<Partial<Entity>>({
     description: template.template_description,
@@ -76,8 +76,8 @@ export function UpdatePage({ template, onUpdate, onBack }: Props): VNode {
     otpId: template.otp_id,
     pay_duration: template.template_contract.pay_duration
       ? Duration.fromTalerProtocolDuration(
-          template.template_contract.pay_duration,
-        )
+        template.template_contract.pay_duration,
+      )
       : undefined,
     summary:
       template.editable_defaults?.summary ?? template.template_contract.summary,
@@ -85,8 +85,8 @@ export function UpdatePage({ template, onUpdate, onBack }: Props): VNode {
       template.editable_defaults?.amount ??
       (template.template_contract.amount as AmountString | undefined),
     currency_editable: !!template.editable_defaults?.currency,
-    summary_editable: !!template.editable_defaults?.summary,
-    amount_editable: !!template.editable_defaults?.amount,
+    summary_editable: template.editable_defaults?.summary !== undefined,
+    amount_editable: template.editable_defaults?.amount !== undefined,
   });
 
   function updateState(up: (s: Partial<Entity>) => Partial<Entity>) {
@@ -117,11 +117,11 @@ export function UpdatePage({ template, onUpdate, onBack }: Props): VNode {
   const errors: FormErrors<Entity> = {
     description: !state.description ? i18n.str`should not be empty` : undefined,
     amount: !state.amount
-      ? undefined
+      ? state.amount_editable ? undefined : i18n.str`required`
       : !parsedPrice
         ? i18n.str`not valid`
         : Amounts.isZero(parsedPrice)
-          ? i18n.str`must be greater than 0`
+          ? state.amount_editable ? undefined : i18n.str`must be greater than 0`
           : undefined,
     minimum_age:
       state.minimum_age && state.minimum_age < 0
@@ -142,23 +142,29 @@ export function UpdatePage({ template, onUpdate, onBack }: Props): VNode {
     (k) => (errors as Record<string, unknown>)[k] !== undefined,
   );
 
+  const zero = Amounts.stringify(Amounts.zeroOfCurrency(config.currency))
+
   const submitForm = () => {
     if (hasErrors) return Promise.reject();
+    const contract_amount = state.amount_editable ? undefined : state.amount as AmountString
+    const contract_summary = state.summary_editable ? undefined : state.summary
+    const template_contract: TalerMerchantApi.TemplateContractDetails = {
+      minimum_age: state.minimum_age!,
+      pay_duration: Duration.toTalerProtocolDuration(state.pay_duration!),
+      amount: contract_amount,
+      summary: contract_summary,
+      currency:
+        cList.length > 1 && state.currency_editable
+          ? undefined
+          : config.currency,
+    }
     return onUpdate({
       template_description: state.description!,
-      template_contract: {
-        minimum_age: state.minimum_age!,
-        pay_duration: Duration.toTalerProtocolDuration(state.pay_duration!),
-        amount: state.amount_editable ? undefined : state.amount,
-        summary: state.summary_editable ? undefined : state.summary,
-        currency:
-          cList.length > 1 && state.currency_editable
-            ? undefined
-            : config.currency,
-      },
+      template_contract,
+      required_currency: contract_amount !== undefined ? undefined : config.currency,
       editable_defaults: {
-        amount: !state.amount_editable ? undefined : state.amount,
-        summary: !state.summary_editable ? undefined : state.summary,
+        amount: !state.amount_editable ? undefined : (state.amount ?? zero),
+        summary: !state.summary_editable ? undefined : (state.summary ?? ""),
         currency:
           cList.length === 1 || !state.currency_editable
             ? undefined