[TYPO3-dev] tt_news Backend Extending and create MN connections

[Marc Ernst]

Hi Typo3'ers,

I'm currently programming a backend dialog extension to tt_news.

My code in the ext_tables.php -> https://gist.github.com/Skyl0/f2141cd71b37c5e33396

I have a problem grasping the MN relational database. All of these Tables exist, but currently it only saves one record.
I need to have later 

1 News has N Vehicles
another News has N Vehicles (or 0)

Pls help me understand this MM TCA Fun.