diff --git a/backend/patches/index.ts b/backend/patches/index.ts
index 9dee78bb9..5d59c1d98 100644
--- a/backend/patches/index.ts
+++ b/backend/patches/index.ts
@@ -4,6 +4,7 @@ import createInventoryNumberSeries from './createInventoryNumberSeries';
 import fixRoundOffAccount from './fixRoundOffAccount';
 import testPatch from './testPatch';
 import updateSchemas from './updateSchemas';
+import setPaymentReferenceType from './setPaymentReferenceType';
 
 export default [
   { name: 'testPatch', version: '0.5.0-beta.0', patch: testPatch },
@@ -28,4 +29,9 @@ export default [
     version: '0.6.6-beta.0',
     patch: createInventoryNumberSeries,
   },
+  {
+    name: 'setPaymentReferenceType',
+    version: '0.21.0',
+    patch: setPaymentReferenceType,
+  },
 ] as Patch[];
diff --git a/backend/patches/setPaymentReferenceType.ts b/backend/patches/setPaymentReferenceType.ts
new file mode 100644
index 000000000..a141e201c
--- /dev/null
+++ b/backend/patches/setPaymentReferenceType.ts
@@ -0,0 +1,9 @@
+import { DatabaseManager } from '../database/manager';
+
+async function execute(dm: DatabaseManager) {
+  await dm.db!.knex!('Payment')
+    .where({ referenceType: null })
+    .update({ referenceType: 'SalesInvoice' });
+}
+
+export default { execute, beforeMigrate: true };