Good Morning Ludwig,
Many thanks for your reply. I do agree with your point on Free Text Invoice as i cannot track related cost associates with my revenue at any point. I don't find proper way to arrive exact Megawatt of Energy that has been generated by consuming Coal,Oil,Gas etc and i cannot keep this energy (FG) in Stock as it would be transmitted immediately.
Which is why i choose to raise the invoice through Free Text Invoice or Through sales order as non-stocked item and account the raw material consumption through Movement Journal or via Projects as suggested by magic1949.
Your thoughts please.