Working capital released at end of project?

Hi John, 8 chapters in and first question, not bad!? 😉

Would it be possible if you could confirm if my understanding of why working capital is relased as a cash inflow at the end of the project is correct (q2 page 47):

I understand we pay money out faster than we receive, so cash is needed as an outflow initially . Is it because eventually we will get all our money in from receivables and the net spend on working capital is by definition zero (any extra received is assumed to be part of the profit, ie $30000 pa operating cash flows)

Cheers

Hugh