diff --git a/libs/application/templates/announcement-of-death/src/lib/dataSchema.ts b/libs/application/templates/announcement-of-death/src/lib/dataSchema.ts
index e1feabcf8435..14f4d0db21e7 100644
--- a/libs/application/templates/announcement-of-death/src/lib/dataSchema.ts
+++ b/libs/application/templates/announcement-of-death/src/lib/dataSchema.ts
@@ -118,6 +118,21 @@ export const dataSchema = z.object({
         dateOfBirth: z.string().min(1).optional(),
         dummy: z.boolean().optional(),
       })
+      .refine(
+        ({ name, relation, nationalId, foreignCitizenship, dateOfBirth }) => {
+          const hasNameAndRelation = name && relation
+
+          if (foreignCitizenship && foreignCitizenship.length !== 0) {
+            return Boolean(dateOfBirth) && hasNameAndRelation
+          } else {
+            return Boolean(nationalId) && hasNameAndRelation
+          }
+        },
+        {
+          message: m.errorNoDateOfBirthProvided.defaultMessage,
+          path: ['dateOfBirth'],
+        },
+      )
       .array()
       .optional(),
     encountered: z.boolean().optional(),
diff --git a/libs/application/templates/announcement-of-death/src/lib/messages.ts b/libs/application/templates/announcement-of-death/src/lib/messages.ts
index db3556c25385..ebbd3a17613f 100644
--- a/libs/application/templates/announcement-of-death/src/lib/messages.ts
+++ b/libs/application/templates/announcement-of-death/src/lib/messages.ts
@@ -558,6 +558,11 @@ Ef ekkert á við sem hér að ofan er talið rennur arfur í ríkissjóð. Nán
     defaultMessage: 'Númer má ekki vera tómt',
     description: 'Invalid general asset number error message',
   },
+  errorNoDateOfBirthProvided: {
+    id: 'aod.application:error.errorNoDateOfBirthProvided',
+    defaultMessage: 'Fæðingardagur þarf að vera fylltur út',
+    description: 'Date of birth is required',
+  },
 
   /* Announcement */
   announcementTitle: {