diff --git a/backend/src/routes/resources/main.ts b/backend/src/routes/resources/main.ts
index ccc74fe..3f32a74 100644
--- a/backend/src/routes/resources/main.ts
+++ b/backend/src/routes/resources/main.ts
@@ -21,6 +21,9 @@ import { decrypt, encrypt } from "../../utils/crypt";
 
 const PORTAL_ALLOWED_RESOURCES = new Set(["customers", "contracts", "createddocuments", "contracttypes"])
 const PORTAL_VISIBLE_DOCUMENT_TYPES = ["invoices", "advanceInvoices", "cancellationInvoices"]
+const OUTGOING_SEPA_MANDATE_STATUSES = new Set(["Entwurf", "Aktiv", "Widerrufen", "Abgelaufen"])
+const OUTGOING_SEPA_MANDATE_TYPES = new Set(["CORE", "B2B"])
+const OUTGOING_SEPA_SEQUENCE_TYPES = new Set(["RCUR", "OOFF", "FRST", "FNAL"])
 
 // -------------------------------------------------------------
 // SQL Suche auf mehreren Feldern (Haupttabelle + Relationen)
@@ -378,6 +381,21 @@ async function validateOutgoingSepaMandatePayload(
         return "Kunde und Bankverbindung sind Pflichtfelder."
     }
 
+    const status = payload.status ?? existing?.status ?? "Entwurf"
+    if (!OUTGOING_SEPA_MANDATE_STATUSES.has(status)) {
+        return "Ungültiger Mandatsstatus."
+    }
+
+    const mandateType = payload.mandateType ?? existing?.mandateType ?? "CORE"
+    if (!OUTGOING_SEPA_MANDATE_TYPES.has(mandateType)) {
+        return "Ungültiger Mandatstyp."
+    }
+
+    const sequenceType = payload.sequenceType ?? existing?.sequenceType ?? "RCUR"
+    if (!OUTGOING_SEPA_SEQUENCE_TYPES.has(sequenceType)) {
+        return "Ungültige Mandatssequenz."
+    }
+
     const [customer] = await server.db
         .select()
         .from(customers)
diff --git a/frontend/stores/data.js b/frontend/stores/data.js
index 21138ff..5a7a0b2 100644
--- a/frontend/stores/data.js
+++ b/frontend/stores/data.js
@@ -56,6 +56,18 @@ import outgoingSepaMandate from "~/components/columnRenderings/outgoingSepaManda
 // @ts-ignore
 export const useDataStore = defineStore('data', () => {
 
+    const outgoingSepaMandateTypeOptions = [
+        { key: "CORE", label: "Basislastschrift (CORE)" },
+        { key: "B2B", label: "Firmenlastschrift (B2B)" }
+    ]
+
+    const outgoingSepaSequenceTypeOptions = [
+        { key: "RCUR", label: "Wiederkehrend (RCUR)" },
+        { key: "OOFF", label: "Einmalig (OOFF)" },
+        { key: "FRST", label: "Erstlastschrift (FRST)" },
+        { key: "FNAL", label: "Letztlastschrift (FNAL)" }
+    ]
+
 
 
     const dataTypes = {
@@ -1224,11 +1236,9 @@ export const useDataStore = defineStore('data', () => {
                     required: true,
                     defaultValue: "CORE",
                     inputType: "select",
-                    selectValueAttribute: "label",
-                    selectManualOptions: [
-                        { label: "CORE" },
-                        { label: "B2B" }
-                    ],
+                    selectValueAttribute: "key",
+                    selectOptionAttribute: "label",
+                    selectManualOptions: outgoingSepaMandateTypeOptions,
                     inputColumn: "Mandat",
                     sortable: true
                 },
@@ -1238,13 +1248,9 @@ export const useDataStore = defineStore('data', () => {
                     required: true,
                     defaultValue: "RCUR",
                     inputType: "select",
-                    selectValueAttribute: "label",
-                    selectManualOptions: [
-                        { label: "RCUR" },
-                        { label: "OOFF" },
-                        { label: "FRST" },
-                        { label: "FNAL" }
-                    ],
+                    selectValueAttribute: "key",
+                    selectOptionAttribute: "label",
+                    selectManualOptions: outgoingSepaSequenceTypeOptions,
                     inputColumn: "Mandat",
                     sortable: true
                 },
@@ -2287,7 +2293,7 @@ export const useDataStore = defineStore('data', () => {
             isArchivable: true,
             label: "Dokumente",
             labelSingle: "Dokument",
-            selectWithInformation: "*, files(*), statementallocations(*)",
+            selectWithInformation: "*, files(*), statementallocations(*), outgoingsepamandate(*)",
             filters: [
                 {
                     name: "Archivierte ausblenden",
@@ -3737,5 +3743,7 @@ export const useDataStore = defineStore('data', () => {
     return {
         dataTypes,
         documentTypesForCreation,
+        outgoingSepaMandateTypeOptions,
+        outgoingSepaSequenceTypeOptions,
     }
 })