diff --git a/htdocs/install/mysql/migration/20.0.0-21.0.0.sql b/htdocs/install/mysql/migration/20.0.0-21.0.0.sql
index 07338c65ac9e5..fc0a2a5725a71 100644
--- a/htdocs/install/mysql/migration/20.0.0-21.0.0.sql
+++ b/htdocs/install/mysql/migration/20.0.0-21.0.0.sql
@@ -60,3 +60,5 @@ ALTER TABLE llx_contrat ADD COLUMN localtax2 double(24,8) DEFAULT 0;
 ALTER TABLE llx_contrat ADD COLUMN revenuestamp double(24,8) DEFAULT 0;
 ALTER TABLE llx_contrat ADD COLUMN total_ht double(24,8) DEFAULT 0;
 ALTER TABLE llx_contrat ADD COLUMN total_ttc double(24,8) DEFAULT 0;
+
+ALTER TABLE llx_expedition_package MODIFY COLUMN dangerous_goods varchar(60) DEFAULT '0';
diff --git a/htdocs/install/mysql/tables/llx_expedition_package.sql b/htdocs/install/mysql/tables/llx_expedition_package.sql
index 2f8d97a26a9de..a4f372603ce80 100644
--- a/htdocs/install/mysql/tables/llx_expedition_package.sql
+++ b/htdocs/install/mysql/tables/llx_expedition_package.sql
@@ -12,7 +12,7 @@ create table llx_expedition_package
   size_units        integer,	       -- unit of all sizes (height, width, depth)
   weight            float,	       -- weight
   weight_units      integer,	       -- unit of weight
-  dangerous_goods   smallint          DEFAULT 0, -- 0 = no dangerous goods or 1 = Explosives, 2 = Flammable Gases, 3 = Flammable Liquids, 4 = Flammable solids, 5 = Oxidizing, 6 = Toxic & Infectious, 7 = Radioactive, 8 = Corrosives, 9 = Miscellaneous (see https://en.wikipedia.org/wiki/Dangerous_goods). I'm not sure if just register 0 (no) or 1 (yes) is enough.
+  dangerous_goods   varchar(20) DEFAULT '0', -- (comma separated list eg : 3,5,7) 0 = no dangerous goods or 1 = Explosives, 2 = Flammable Gases, 3 = Flammable Liquids, 4 = Flammable solids, 5 = Oxidizing, 6 = Toxic & Infectious, 7 = Radioactive, 8 = Corrosives, 9 = Miscellaneous (see https://en.wikipedia.org/wiki/Dangerous_goods). I'm not sure if just register 0 (no) or 1 (yes) is enough.
   tail_lift         smallint          DEFAULT 0, -- 0 = no tail lift required to load/unload package(s), 1 = a tail lift is required to load/unload package(s). Sometime tail lift load can be different than tail lift delivery so maybe adding a new table line.
   rang              integer  DEFAULT 0
 )ENGINE=innodb;