How do you automate not the harvesting by itself, but the harvesting of the harvest
![Grin ;D](https://aurora2.pentarch.org/Smileys/classic/grin.gif)
If a tanker has an order to refuel from target fleet, either there will be a message saying it can't fill up if the round-trip is too fast, or after a while (if the harvesters produce more than the tanker takes away at interval), there will be an overflow.