diff --git a/htdocs/core/class/html.formother.class.php b/htdocs/core/class/html.formother.class.php
index 99ee1b6af9b..1d8dd1db08e 100644
--- a/htdocs/core/class/html.formother.class.php
+++ b/htdocs/core/class/html.formother.class.php
@@ -77,7 +77,10 @@ class FormOther
 		$out .= '<input type="radio" name="barcodemode" value="barcodeforproduct"> Scan a product barcode<br>';
 		$out .= '<input type="radio" name="barcodemode" value="barcodeforlotserial"> Scan a product lot or serial number<br>';
 
-		$out .= $langs->trans("QtyToAddAfterBarcodeScan").' <input type="text" name="barcodeproductqty" class="width50 right" value="1"><br>';
+		$stringaddbarcode = $langs->trans("QtyToAddAfterBarcodeScan","tmphtml");
+		$htmltoreplaceby = '<select name="selectaddorreplace"><option selected value="add">'.$langs->trans("Add").'</option><option value="replace">'.$langs->trans("ToReplace").'</option></select>';
+		$stringaddbarcode = str_replace("tmphtml",$htmltoreplaceby,$stringaddbarcode);
+		$out .= $stringaddbarcode.' <input type="text" name="barcodeproductqty" class="width50 right" value="1"><br>';
 		$out .= '<textarea type="text" name="barcodelist" class="centpercent" autofocus rows="'.ROWS_3.'"></textarea>';
 
 		/*print '<br>'.$langs->trans("or").'<br>';
diff --git a/htdocs/langs/en_US/productbatch.lang b/htdocs/langs/en_US/productbatch.lang
index 71e44e8f281..dd1e0ea4027 100644
--- a/htdocs/langs/en_US/productbatch.lang
+++ b/htdocs/langs/en_US/productbatch.lang
@@ -30,7 +30,7 @@ ManageLotMask=Custom mask
 CustomMasks=Option to define a different numbering mask for each product
 BatchLotNumberingModules=Numbering rule for automatic generation of lot number
 BatchSerialNumberingModules=Numbering rule for automatic generation of serial number (for products with property 1 unique lot/serial for each product)
-QtyToAddAfterBarcodeScan=Qty to add for each barcode/lot/serial scanned
+QtyToAddAfterBarcodeScan=Qty to %s for each barcode/lot/serial scanned
 LifeTime=Life span (in days)
 EndOfLife=End of life
 ManufacturingDate=Manufacturing date
@@ -42,3 +42,4 @@ HideLots=Hide lots
 #Traceability - qc status
 OutOfOrder=Out of order
 InWorkingOrder=In working order
+ToReplace=Replace
\ No newline at end of file
diff --git a/htdocs/langs/fr_FR/productbatch.lang b/htdocs/langs/fr_FR/productbatch.lang
index ccd5e43d3d7..bcef04e75ed 100644
--- a/htdocs/langs/fr_FR/productbatch.lang
+++ b/htdocs/langs/fr_FR/productbatch.lang
@@ -30,7 +30,7 @@ ManageLotMask=Masque personnalisé
 CustomMasks=Option pour définir un masque de numérotation différent pour chaque produit
 BatchLotNumberingModules=Règle de numérotation pour la génération automatique de numéro de lot
 BatchSerialNumberingModules=Règle de numérotation pour la génération automatique de numéro de série (pour les produits avec propriété 1 lot/série unique pour chaque produit)
-QtyToAddAfterBarcodeScan=Quantité à ajouter pour chaque code à barres/lot/série scanné
+QtyToAddAfterBarcodeScan=Quantité à %s pour chaque code à barres/lot/série scanné
 LifeTime=Durée de vie (en jours)
 EndOfLife=Fin d'utilisation
 ManufacturingDate=Date de fabrication
diff --git a/htdocs/product/inventory/ajax/ajax.inventory.php b/htdocs/product/inventory/ajax/ajax.inventory.php
deleted file mode 100644
index 920607f4c1e..00000000000
--- a/htdocs/product/inventory/ajax/ajax.inventory.php
+++ /dev/null
@@ -1,47 +0,0 @@
-<?php
-
-require '../../../main.inc.php';
-require_once DOL_DOCUMENT_ROOT.'/product/inventory/class/inventory.class.php';
-
-$get = GETPOST('get', 'alpha');
-$put = GETPOST('put', 'alpha');
-
-switch ($put) {
-	case 'qty':
-		if (empty($user->rights->stock->creer)) {
-			echo -1; exit;
-		}
-
-		$fk_det_inventory = GETPOST('fk_det_inventory');
-
-		$det = new InventoryLine($db);
-		if ($det->fetch($fk_det_inventory)) {
-			$det->qty_view += GETPOST('qty');
-			$res = $det->update($user);
-
-			echo $det->qty_view;
-		} else {
-			echo -2;
-		}
-
-		break;
-
-	case 'pmp':
-		if (empty($user->rights->stock->creer) || empty($user->rights->stock->changePMP)) {
-			echo -1; exit;
-		}
-
-		$fk_det_inventory = GETPOST('fk_det_inventory');
-
-		$det = new InventoryLine($db);
-		if ($det->fetch($fk_det_inventory)) {
-			$det->new_pmp = price2num(GETPOST('pmp'));
-			$det->update($user);
-
-			echo $det->new_pmp;
-		} else {
-			echo -2;
-		}
-
-		break;
-}
diff --git a/htdocs/product/inventory/ajax/searchfrombarcode.php b/htdocs/product/inventory/ajax/searchfrombarcode.php
new file mode 100644
index 00000000000..259aa5999f6
--- /dev/null
+++ b/htdocs/product/inventory/ajax/searchfrombarcode.php
@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ *	\file       /htdocs/product/inventory/ajax/searchfrombarcode.php
+ *	\brief      File to make Ajax action on product and stock
+ */
+
+if (!defined('NOTOKENRENEWAL')) {
+	define('NOTOKENRENEWAL', '1'); // Disables token renewal
+}
+if (!defined('NOREQUIREHTML')) {
+	define('NOREQUIREHTML', '1');
+}
+if (!defined('NOREQUIREAJAX')) {
+	define('NOREQUIREAJAX', '1');
+}
+if (!defined('NOREQUIRESOC')) {
+	define('NOREQUIRESOC', '1');
+}
+if (!defined('NOCSRFCHECK')) {
+	define('NOCSRFCHECK', '1');
+}
+// Do not check anti CSRF attack test
+if (!defined('NOREQUIREMENU')) {
+	define('NOREQUIREMENU', '1');
+}
+// If there is no need to load and show top and left menu
+if (!defined("NOLOGIN")) {
+	define("NOLOGIN", '1');
+}
+if (!defined('NOIPCHECK')) {
+	define('NOIPCHECK', '1'); // Do not check IP defined into conf $dolibarr_main_restrict_ip
+}
+if (!defined('NOBROWSERNOTIF')) {
+	define('NOBROWSERNOTIF', '1');
+}
+require '../../../main.inc.php';
+require_once DOL_DOCUMENT_ROOT.'/product/inventory/class/inventory.class.php';
+
diff --git a/htdocs/product/inventory/inventory.php b/htdocs/product/inventory/inventory.php
index 9a4d61209ba..9445e7896c6 100644
--- a/htdocs/product/inventory/inventory.php
+++ b/htdocs/product/inventory/inventory.php
@@ -542,6 +542,7 @@ if ($object->id > 0) {
 			print '<script>';
 			print 'function barcodescannerjs(){
 				console.log("We catch inputs in sacnner box");
+				var selectaddorreplace = $("select[name=selectaddorreplace]").val();
 				var barcodemode = $("input[name=barcodemode]:checked").val();
 				var barcodeproductqty = $("input[name=barcodeproductqty]").val();
 				var textarea = $("textarea[name=barcodelist]").val();
@@ -565,56 +566,22 @@ if ($object->id > 0) {
 								}
 							})
 						}
-						tabproduct.push({\'Id\':id,\'Warehouse\':warehouse,\'Barcode\':productbarcode,\'Batch\':productbatchcode,\'Qty\':0});
+						productinput = $("#"+id+"_input").val();
+						if(productinput == ""){
+							productinput = 0
+						}
+						tabproduct.push({\'Id\':id,\'Warehouse\':warehouse,\'Barcode\':productbarcode,\'Batch\':productbatchcode,\'Qty\':productinput});
 					})
 					switch(barcodemode){
 						case "barcodeforautodetect":
-							textarray.forEach(function(element,index){
-								console.log("Product autodetect "+(index+=1)+": "+element);
-								BatchCodeDoesNotExist=0;
-								tabproduct.forEach(product => {
-									if(product.Batch == element || product.Barcode == element){
-										product.Qty+=1;
-									}else{
-										BatchCodeDoesNotExist+=1;
-									}
-								})
-								if(BatchCodeDoesNotExist >= tabproduct.length){
-									alert("'.$langs->trans('ProductDoesNotExist').': "+element);
-								}
-							})
+							barcodeserialforproduct(textarray,tabproduct,barcodeproductqty,selectaddorreplace,"barcode",true);
+							barcodeserialforproduct(textarray,tabproduct,barcodeproductqty,selectaddorreplace,"lotserial",true);
 							break;
-						case "barcodeforproduct":
-							textarray.forEach(function(element,index){
-								console.log("Product "+(index+=1)+": "+element);
-								BarCodeDoesNotExist=0;
-								tabproduct.forEach(product => {
-									if(product.Barcode == element){
-										product.Qty+=1;
-									}else{
-										BarCodeDoesNotExist+=1;
-									}
-								})
-								if(BarCodeDoesNotExist >= tabproduct.length){
-									alert("'.$langs->trans('ProductBarcodeDoesNotExist').': "+element);
-								}
-							})
+						case "barcodeforproduct": //TODO: create product !exist + ajout
+							barcodeserialforproduct(textarray,tabproduct,barcodeproductqty,selectaddorreplace,"barcode");
 							break;
 						case "barcodeforlotserial":
-							textarray.forEach(function(element,index){
-								console.log("Product batch/serial "+(index+=1)+": "+element);
-								BatchCodeDoesNotExist=0;
-								tabproduct.forEach(product => {
-									if(product.Batch == element){
-										product.Qty+=1;
-									}else{
-										BatchCodeDoesNotExist+=1;
-									}
-								})
-								if(BatchCodeDoesNotExist >= tabproduct.length){
-									alert("'.$langs->trans('ProductBatchDoesNotExist').': "+element);
-								}
-							})
+							barcodeserialforproduct(textarray,tabproduct,barcodeproductqty,selectaddorreplace,"lotserial");
 							break;
 						default:
 							alert("'.$langs->trans("ErrorWrongBarcodemode").' \""+barcodemode+"\"");
@@ -623,17 +590,50 @@ if ($object->id > 0) {
 					tabproduct.forEach(product => {
 						if(product.Qty!=0){
 							console.log("We change #"+product.Id+"_input to match input in scanner box");
-							$("#"+product.Id+"_input").val(product.Qty*barcodeproductqty);
+							$("#"+product.Id+"_input").val(product.Qty);
 						}
 					})
 					document.forms["formrecord"].submit();
 				}
-			}';
+
+			}
+
+			function barcodeserialforproduct(textarray,tabproduct,barcodeproductqty,selectaddorreplace,mode,autodetect=false){
+				textarray.forEach(function(element,index){
+					console.log("Product "+(index+=1)+": "+element);
+					BarCodeDoesNotExist=0;
+					tabproduct.forEach(product => {
+						if(mode == "barcode"){
+							testonproduct = product.Barcode
+						}else if (mode == "lotserial"){
+							testonproduct = product.Batch
+						}
+						if(testonproduct == element){
+							if(selectaddorreplace == "add"){
+								productqty = parseInt(product.Qty,10)
+								product.Qty = productqty + (1*barcodeproductqty)
+							}else if(selectaddorreplace == "replace"){
+								product.Qty = (1*barcodeproductqty)
+							}
+						}else{
+							BarCodeDoesNotExist+=1;
+						}
+					})
+					if(autodetect == false){
+						if(BarCodeDoesNotExist >= tabproduct.length && mode == "barcode"){
+							alert("'.$langs->trans('ProductBarcodeDoesNotExist').': "+element);
+						}else if(BarCodeDoesNotExist >= tabproduct.length && mode == "lotserial"){
+							alert("'.$langs->trans('ProductBatchDoesNotExist').': "+element);
+						}
+					}
+				})
+			}
+			';
 			print '</script>';
 		}
 		include DOL_DOCUMENT_ROOT.'/core/class/html.formother.class.php';
 		$formother = new FormOther($db);
-		print $formother->getHTMLScannerForm();
+		print $formother->getHTMLScannerForm("barcodescannerjs");
 	}
 
 	//Call method to undo changes in real qty