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<mvt:do name="l.return" file="g.Module_Library_DB" value="Runtime_Product_Load_ID( product_id, l.product )" />
<mvt:do name="l.return" file="g.Module_Library_DB" value="Runtime_Product_Load_Code( 'product_code', l.product )" />

&mvt:product:code;

Note: The Runtime prefix to these functions make it so inventory is taken into account as well as 
things like active and price or availibility groups. These functions also exist without the runtime 
prefix (Product_Load_Code and Product_Load_ID)