diff --git a/htdocs/product/card.php b/htdocs/product/card.php
index 086163975a3..0f37edaf398 100644
--- a/htdocs/product/card.php
+++ b/htdocs/product/card.php
@@ -807,7 +807,7 @@ if (empty($reshook)) {
 				if ($fk_default_bom >= 0) {
 					$object->fk_default_bom = $fk_default_bom;
 				} else {
-					$object->fk_default_bom = null;
+					$object->fk_default_bom = 0;
 				}
 
 				$units = GETPOSTINT('units');
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 5c59e925394..dc69488ce8b 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -310,7 +310,7 @@ class Product extends CommonObject
 	/**
 	 * Status indicates whether the product is on sale '1' or not '0'
 	 * @var int
-	 * @deprecated
+	 * @deprecated  Use $status instead
 	 * @see $status
 	 */
 	public $tosell;
@@ -325,7 +325,7 @@ class Product extends CommonObject
 	/**
 	 * Status indicate whether the product is available for purchase '1' or not '0'
 	 * @var int
-	 * @deprecated
+	 * @deprecated Use $status_buy instead
 	 * @see $status_buy
 	 */
 	public $tobuy;
@@ -333,7 +333,7 @@ class Product extends CommonObject
 	/**
 	 * Status indicates whether the product is a finished product '1' or a raw material '0'
 	 *
-	 * @var int
+	 * @var ?int
 	 */
 	public $finished;