diff --git a/src/database/schemas/finance/invoice.schema.js b/src/database/schemas/finance/invoice.schema.js
index f703c79..89cb964 100644
--- a/src/database/schemas/finance/invoice.schema.js
+++ b/src/database/schemas/finance/invoice.schema.js
@@ -33,8 +33,8 @@ const invoiceSchema = new Schema(
     shippingAmountWithTax: { type: Number, required: true, default: 0 },
     grandTotalAmount: { type: Number, required: true, default: 0 },
     totalTaxAmount: { type: Number, required: true, default: 0 },
-    vendor: { type: Schema.Types.ObjectId, ref: 'vendor', required: false },
-    client: { type: Schema.Types.ObjectId, ref: 'client', required: false },
+    from: { type: Schema.Types.ObjectId, ref: 'vendor', required: false },
+    to: { type: Schema.Types.ObjectId, ref: 'client', required: false },
     state: {
       type: { type: String, required: true, default: 'draft' },
     },
@@ -43,6 +43,7 @@ const invoiceSchema = new Schema(
     issuedAt: { type: Date, required: false },
     dueAt: { type: Date, required: false },
     postedAt: { type: Date, required: false },
+    acknowledgedAt: { type: Date, required: false },
     paidAt: { type: Date, required: false },
     cancelledAt: { type: Date, required: false },
     invoiceOrderItems: [invoiceOrderItemSchema],