Classification of supply - pure supply of goods or pure supply...

Classification of supply - pure supply of goods or pure supply of services? - The impugned contract, in the instant case, is a composite supply where the principal supply is supply of goods. It is an accepted fact that the consideration is received on monthly basis; invoice is raised on energy savings; value of such invoice is equal to 90% of the energy savings. - The time of supply is the date of invoice and the consideration is equal to the value of the invoice, the GST rate being 12%. - AAR