Ann: 4Q20 Appendix 4C and FY20 guidance, page-4

Accrual vs cash. When a sale is made, this is a revenue event. When the customer later pays, this is a receipts from customers event.

So basically as at 30 June, there is $5.7 of EOF’s sales for which the customer has not yet paid.

This is not usual, most of the mismatch would likely be that customers will be on payment terms of a specified period such as 30 days or 60 days and (say) have committed to a 2nd order of masks in future months but aren’t going to pay until the new order is received.