@tacas 

Use the video below instead (I'm only able to attach the link for some reason and not the preview).  He is specifically addressing the cash basis income issue when billing retention in Desktop.  The video you posted doesn't address cash basis issues and is only addressing how to bill for the retainage receivable already recorded as an OCA and how to get it to post to A/R.

https://www.youtube.com/watch?v=PUBGl5Sc-xk