I am preparing a quote for professional services.  The different services are charged at different rates, e.g. engineering services are more expensive than accounting services.  However, it seems that Odoo won't let me put the different services with different rates on the same quote; I can enter them but when I try to save, Odoo puts up a dialog box that stays: "You can use only one product on timesheet within the same sale order. You should split your order to include only one contract based on time and material."  

I have 4 different service levels.  I can't provide 4 different quotes to the customer.  Any suggestions on how to resolve this ?

Thanks in advance,

Mike