diff --git a/src/app/components/create-purchaseorder-form/create-purchaseorder-form.html b/src/app/components/create-purchaseorder-form/create-purchaseorder-form.html
index 4b08f97..304b160 100644
--- a/src/app/components/create-purchaseorder-form/create-purchaseorder-form.html
+++ b/src/app/components/create-purchaseorder-form/create-purchaseorder-form.html
@@ -15,7 +15,9 @@
         </nz-form-label>
 
         <nz-form-control nzSpan="12" nzErrorTip="Ce champ est requis">
-            <nz-select formControlName="supplierId" [nzPlaceHolder]="getBestSupplier().name ?? 'Choisir un fournisseur'"
+            <nz-select formControlName="supplierId"
+                       (ngModelChange)="refresh()"
+                       [nzPlaceHolder]="getBestSupplier().name ?? 'Choisir un fournisseur'"
                        nzShowSearch>
                 @for (supplier of suppliers(); track supplier.id) {
                     <nz-option [nzLabel]="supplier.name" [nzValue]="supplier.id"></nz-option>
diff --git a/src/app/components/create-purchaseorder-form/create-purchaseorder-form.ts b/src/app/components/create-purchaseorder-form/create-purchaseorder-form.ts
index 168325c..8673802 100644
--- a/src/app/components/create-purchaseorder-form/create-purchaseorder-form.ts
+++ b/src/app/components/create-purchaseorder-form/create-purchaseorder-form.ts
@@ -46,10 +46,18 @@ export class CreatePurchaseorderForm {
                 bestSupplier = x;
             }
         })
-
         return bestSupplier;
     }
 
+    getProductsOfSupplier() {
+        const supplier = this.suppliers().find(x => x.id === this.createPurchaseOrderForm.value.supplierId);
+        if (!supplier) return [];
+
+        const supplierProductIds = supplier.prices.map(x => x.productId);
+
+        return this.products().filter(product => supplierProductIds.includes(product.id));
+    }
+
     createPurchaseOrderForm: FormGroup = new FormGroup({
         purchaseConditions: new FormControl<string | null>(null, Validators.required),
         lines: new FormArray([], Validators.required),
@@ -61,19 +69,25 @@ export class CreatePurchaseorderForm {
     }
 
     addProductToForm() {
+        const supplierId = this.createPurchaseOrderForm.value.supplierId ?? this.getBestSupplier().id;
+        this.createPurchaseOrderForm.patchValue({
+            supplierId
+        });
+
+        this.refresh();
+    }
+
+    refresh(){
         this.lines.clear();
-        this.products().forEach(x => {
+
+        this.getProductsOfSupplier().forEach(x => {
             this.lines.push(
                 new FormGroup({
                     productId: new FormControl(x.id),
                     name: new FormControl(x.name),
-                    quantity: new FormControl(1, [Validators.required, Validators.min(0)])
+                    quantity: new FormControl(1, [Validators.required, Validators.min(1)])
                 })
             );
         });
-
-        this.createPurchaseOrderForm.patchValue({
-            supplierId: this.getBestSupplier().id,
-        });
     }
 }