<%IF $product_id THEN
QUERY Product(state='ACTIVE', product_id=$product_id) DO DISPLAY
IF $Numrows > 0 AND $Rownum==1 THEN %>
<% $category_id = $saved_category_id %>
<%IF $Shop.opt_productinfofields THEN%>
<%ENDIF%>
<%IF $Shop.opt_variant_grouping AND $variant_grouping THEN%>
<%ENDIF%>
<%NEXTROW
IF $Numrows == 0 THEN HEADER "Status", "404 Product not found" ENDIF
ENDQUERY
ELSE
HEADER "Status", "404 No product"
ENDIF%>