Ann: Appendix 4C Cash Flow Report, page-15

yes it is credit terms, but you have to assume a never ending business where there is timing differences and that is the concept of the Cash Flow Statement being actual incomings and outgoings during the period.

You could think of the cash burn like that, but you would also need to take into consideration how much of the raw materials purchases are o/s to be paid by FOD too, because that'd be extra cash out the door, hence the Cash Flow being based upon actual cash in and out the door.