diff --git a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
index 25a6a6b09e8..3fb671fa9b2 100644
--- a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
+++ b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
@@ -418,7 +418,7 @@ UPDATE llx_propal SET fk_user_signature = fk_user_cloture WHERE fk_user_signatur
 UPDATE llx_propal SET date_signature = date_cloture WHERE date_signature IS NULL AND date_cloture IS NOT NULL;
 
 
-ALTER TABLE llx_product ADD COLUMN batch_mask VARCHAR(32) NULL;
+ALTER TABLE llx_product ADD COLUMN batch_mask VARCHAR(32) DEFAULT NULL;
 ALTER TABLE llx_product ADD COLUMN lifetime INTEGER NULL;
 ALTER TABLE llx_product ADD COLUMN qc_frequency INTEGER NULL;
 
diff --git a/htdocs/install/mysql/tables/llx_product.sql b/htdocs/install/mysql/tables/llx_product.sql
index 73b4473a5a4..4aad3393137 100644
--- a/htdocs/install/mysql/tables/llx_product.sql
+++ b/htdocs/install/mysql/tables/llx_product.sql
@@ -59,7 +59,7 @@ create table llx_product
   tobuy                         tinyint      DEFAULT 1,             -- Product you buy
   onportal                      tinyint      DEFAULT 0,	            -- If it is a product you sell and you want to sell it on portal (module website must be on)
   tobatch                       tinyint      DEFAULT 0 NOT NULL,    -- Is it a product that need a batch management (eat-by or lot management)
-  batch_mask			        varchar(32),                        -- If the product has batch feature, you may want to use a batch mask per product
+  batch_mask			        varchar(32)  DEFAULT NULL,          -- If the product has batch feature, you may want to use a batch mask per product
   fk_product_type               integer      DEFAULT 0,             -- Type of product: 0 for regular product, 1 for service, 9 for other (used by external module)
   duration                      varchar(6),
   seuil_stock_alerte            float      DEFAULT NULL,
@@ -95,7 +95,7 @@ create table llx_product
   canvas                        varchar(32)  DEFAULT NULL,
   finished                      tinyint      DEFAULT NULL,          -- see dictionnary c_product_nature
   lifetime                      integer      DEFAULT NULL,
-  qc_frequency 					integer 	 DEFAULT NULL,
+  qc_frequency 					integer 	 DEFAULT NULL,			-- Quality control periodicity
   hidden                        tinyint      DEFAULT 0,             -- Not used. Deprecated.
   import_key                    varchar(14),                        -- Import key
   model_pdf                     varchar(255),                       -- model save dodument used