*ORDER_REQUIRE_SOURCE => Make the input field "Source of order" mandatory.
*ORDER_ALLOW_EXTERNAL_DOWNLOAD => When a PDF is generated, a share key is automatically set so the file can be downloaded using the share key. ► (v7.0+)
*THIRDPARTY_PROPAGATE_EXTRAFIELDS_TO_ORDER => Copy extrafields from thirdparty to order. ► (v11.0+)
*MAIN_USE_PROPAL_REFCLIENT_FOR_ORDER => Copy customer reference from proposal to order. ► (v7.0+)
*ORDER_ENABLE_NEGATIVE => Can validate an order when amount is negative
*WAREHOUSE_ASK_WAREHOUSE_DURING_ORDER => When an order is created, the warehouse can be defined