diff --git a/src/store/delivery/delete.js b/src/store/delivery/delete.js
index 8025730..850ecdc 100644
--- a/src/store/delivery/delete.js
+++ b/src/store/delivery/delete.js
@@ -1,5 +1,6 @@
 import * as mssqlQueries from '../../providers/mssql/queries/delivery.js';
 import * as sqliteQueries from '../../providers/sqlite3/queries/delivery.js';
+import { isForeignKeyConstraintError } from '../../providers/provider.js';
 import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
 import makeRunner from '../runner.js';
 
@@ -16,15 +17,22 @@ export default function del(provider) {
     const { companyId } = await access(googleAuthId);
     const runner = makeRunner(provider);
 
-    const result = await runner(queries.DELETE_MANIFEST, {
-      id,
-      companyId,
-      type: queries.DELIVERY_TYPE,
-    });
+    try {
+      const result = await runner(queries.DELETE_MANIFEST, {
+        id,
+        companyId,
+        type: queries.DELIVERY_TYPE,
+      });
 
-    const rowsAffected = result.rowsAffected?.[0] ?? (typeof result.rowsAffected === 'number' ? result.rowsAffected : 0);
-    if (!rowsAffected) {
-      throw new Error('Delivery not found');
+      const rowsAffected = result.rowsAffected?.[0] ?? (typeof result.rowsAffected === 'number' ? result.rowsAffected : 0);
+      if (!rowsAffected) {
+        throw new Error('Delivery not found');
+      }
+    } catch (err) {
+      if (isForeignKeyConstraintError(err)) {
+        throw new Error('Delivery in use in ledger');
+      }
+      throw err;
     }
   };
 }
diff --git a/src/store/delivery/update.js b/src/store/delivery/update.js
index 9d10bd1..098a994 100644
--- a/src/store/delivery/update.js
+++ b/src/store/delivery/update.js
@@ -1,5 +1,6 @@
 import * as mssqlQueries from '../../providers/mssql/queries/delivery.js';
 import * as sqliteQueries from '../../providers/sqlite3/queries/delivery.js';
+import { isForeignKeyConstraintError } from '../../providers/provider.js';
 import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
 import taxEnsure from '../tax/ensure.js';
 import { insertLines, normalizeLines, parseDate } from '../manifestLines.js';
@@ -108,9 +109,16 @@ export default function update(provider) {
       });
 
       if (hasLines) {
-        await runner(queries.DELETE_LINES_BY_MANIFEST, {
-          manifestId: id,
-        });
+        try {
+          await runner(queries.DELETE_LINES_BY_MANIFEST, {
+            manifestId: id,
+          });
+        } catch (err) {
+          if (isForeignKeyConstraintError(err)) {
+            throw new Error('Delivery lines already booked on ledger');
+          }
+          throw err;
+        }
 
         await insertLines(provider, tx, {
           manifestId: id,