Tsk, tsk.

EVE Online players will want to pay attention to this announcement so that they won't accidentally be accused of exploiting:

Cynosural field inside Starbase forcefield is an exploit!
There have been some cases where players have been able to place a cynosural field inside their Starbase forcefield and thus gaining certain advantages for themselves and their cyno-jumping allies. It should not be possible to deploy a cyno-field inside a Starbase forcefield, this is therefore classed as an exploit and we will take action against anyone found using it.

See for yourself at the EVE community site.