Hi Stefan, hi Igor,
no, there is no difference in the meta model. The difference is that BOBX is restricted to features which are officially released. As soon as you use BOBF to edit your BO, you risk using features which are not released to customers. When switching back to BOBX (by manually setting the customer flag) you do not remove such features from your BO. They are still used, but not visible in Tx BOBX.
By switching to BOBF you are leaving the officially supported track. Switching back to BOBX is safe only if you did not really use any BOBF-spefic features. However, there is no way to check for a given BO if it uses only supported features. So, better do not use BOBF if at all possible.
Kind Regards,
Ivo