diff --git a/static/js/shop.jsx b/static/js/shop.jsx
index af0cdd0..1de9cf9 100644
--- a/static/js/shop.jsx
+++ b/static/js/shop.jsx
@@ -145,6 +145,7 @@ class Layout extends React.PureComponent {
       RFQBodyType: PropTypes.string,
       RFQBodyOrder: PropTypes.string,
       onClickLoadCustomConf: PropTypes.func,
+      items: PropTypes.object,
     };
   }
 
@@ -165,6 +166,12 @@ class Layout extends React.PureComponent {
     this.handleCustomConfig = this.handleCustomConfig.bind(this);
     this.handleClickLoad = this.handleClickLoad.bind(this);
     this.checkValidation = this.checkValidation.bind(this);
+
+    // retrieve list of available pn
+    const items_keys = Object.keys(props.items);
+    this.list_pn = items_keys.map(function (key) {
+      return props.items[key].name_number;
+    });
   }
 
   handleCustomConfig(e) {
@@ -249,6 +256,22 @@ class Layout extends React.PureComponent {
       };
     });
 
+    const self = this;
+    const unknow_pn = conf_obj.items.filter(function (item_pn) {
+      return self.list_pn.includes(item_pn.pn) === false;
+    }).map(function (item_pn) {
+      return item_pn.pn;
+    });
+
+    if (unknow_pn.length > 0) {
+      return this.setState({
+        ...this.state,
+        customconf: conf,
+        customconf_ready: null,
+        error: `${unknow_pn.join(', ')} unknown${unknow_pn.length > 1 ? 's':''} pn number`,
+      });
+    }
+
     this.setState({
       ...this.state,
       customconf: conf,
@@ -2293,6 +2316,7 @@ class Shop extends React.PureComponent {
             onClickToggleMobileSideMenu={this.handleClickToggleMobileSideMenu}
             onClickCloseRFQFeedback={this.handleClickCloseRFQFeedback}
             onClickLoadCustomConf={this.handleLoadCustomConf}
+            items={items}
             aside={
               <Backlog
                   currency={currency}