diff --git a/src/app/features/store/pages/checkout-page/checkout-page.component.html b/src/app/features/store/pages/checkout-page/checkout-page.component.html
index 7bd8d57..ade0df5 100644
--- a/src/app/features/store/pages/checkout-page/checkout-page.component.html
+++ b/src/app/features/store/pages/checkout-page/checkout-page.component.html
@@ -51,7 +51,7 @@
         [allowModify]="true"
         [showModifyWhenReadonly]="true"
         [modifyAsAction]="true"
-        [editingDisabled]="isCancellingPurchase()"
+        [editingDisabled]="isPurchaseModificationDisabled()"
         backgroundColor="transparent"
         (modify)="onModifyPurchase()"
       />
diff --git a/src/app/features/store/pages/checkout-page/checkout-page.component.spec.ts b/src/app/features/store/pages/checkout-page/checkout-page.component.spec.ts
index 0444625..622495e 100644
--- a/src/app/features/store/pages/checkout-page/checkout-page.component.spec.ts
+++ b/src/app/features/store/pages/checkout-page/checkout-page.component.spec.ts
@@ -211,6 +211,22 @@ describe('CheckoutPageComponent payment validation', () => {
     expect(routerStub.navigate).not.toHaveBeenCalled();
   });
 
+  it('prevents modifying the purchase after Ya transferí is clicked', async () => {
+    const { component } = createComponent();
+    component.selectedPaymentMethod.set('transfer');
+
+    await component.onComplete();
+
+    expect(component.hasSubmittedTransfer()).toBe(true);
+    expect(component.isPurchaseModificationDisabled()).toBe(true);
+
+    await component.onModifyPurchase();
+
+    expect(checkoutServiceStub.cancelPurchase).not.toHaveBeenCalled();
+    expect(globalLoadingServiceStub.start).not.toHaveBeenCalled();
+    expect(routerStub.navigate).not.toHaveBeenCalled();
+  });
+
   it('navigates after a transfer is confirmed as paid', async () => {
     checkoutServiceStub.getPurchase.mockResolvedValue({ status: 'paid' });
     const { component } = createComponent();
@@ -508,7 +524,6 @@ describe('CheckoutPageComponent payment validation', () => {
     expect(globalLoadingServiceStub.stop).toHaveBeenCalledOnce();
 
     await component.canDeactivate();
-
   });
 
   it('updates customer data on the existing purchase before payment', async () => {
diff --git a/src/app/features/store/pages/checkout-page/checkout-page.component.ts b/src/app/features/store/pages/checkout-page/checkout-page.component.ts
index 3bdc1a3..3573e18 100644
--- a/src/app/features/store/pages/checkout-page/checkout-page.component.ts
+++ b/src/app/features/store/pages/checkout-page/checkout-page.component.ts
@@ -122,6 +122,10 @@ export class CheckoutPageComponent implements OnInit, OnDestroy {
 
   protected readonly isUpdatingPurchase = signal(false);
   protected readonly isCancellingPurchase = signal(false);
+  protected readonly hasSubmittedTransfer = signal(false);
+  protected readonly isPurchaseModificationDisabled = computed(
+    () => this.isCancellingPurchase() || this.hasSubmittedTransfer(),
+  );
   protected readonly createdPurchaseId = signal<number | null>(null);
   protected readonly isGeneratingIntent = signal(false);
   protected readonly isPaymentLoading = computed(() => this.isGeneratingIntent());
@@ -187,7 +191,7 @@ export class CheckoutPageComponent implements OnInit, OnDestroy {
   }
 
   protected async onModifyPurchase(): Promise<void> {
-    if (this.isCancellingPurchase()) {
+    if (this.isPurchaseModificationDisabled()) {
       return;
     }
 
@@ -413,6 +417,7 @@ export class CheckoutPageComponent implements OnInit, OnDestroy {
     }
 
     this.stopTransferPolling();
+    this.hasSubmittedTransfer.set(true);
     this.transferValidationStatus.set('checking');
     this.transferPollingAttempts = 0;