diff --git a/tienda_ilusion/don_confiao/frontend/don-confiao/src/components/Purchase.vue b/tienda_ilusion/don_confiao/frontend/don-confiao/src/components/Purchase.vue
index 5741c5f..9340e08 100644
--- a/tienda_ilusion/don_confiao/frontend/don-confiao/src/components/Purchase.vue
+++ b/tienda_ilusion/don_confiao/frontend/don-confiao/src/components/Purchase.vue
@@ -71,7 +71,7 @@
                   v-model.number="line.quantity"
                   label="Cantidad"
                   type="number"
-                  :rules="[rules.required]"
+                  :rules="[rules.required,rules.positive]"
                   required
               ></v-text-field>
           </v-col>
@@ -176,17 +176,18 @@
          saleline_set: [{product:'', unit_price: 0, quantity: 0, unit: ''}],
        },
        rules: {
-         required: value => !!value || 'Requerido.',
+           required: value => !!value || 'Requerido.',
+           positive: value => value > 0 || 'La cantidad debe ser mayor que 0.',
        },
-       menuItems: [
-         { title: 'Inicio', route: '/'},
-         { title: 'Compras', route:'/compras'},
-       ],
-       clients: [],
-       products: [],
+         menuItems: [
+             { title: 'Inicio', route: '/'},
+             { title: 'Compras', route:'/compras'},
+         ],
+         clients: [],
+         products: [],
      };
    },
-   created() {
+     created() {
      this.fetchClients();
      this.fetchProducts();
      this.fetchPaymentMethods();