[TYPO3-mvc] after upgrade 6.0 to 6.1 error with domain model update "must be persisted already, but is new"

[Domi]

Hello,

Philipp mentioned it could rely on the new property mapper, which comes 
by default. As I never understood how this works in the CRUD pattern has 
anyone some examples how to use the new property mapping in real world? 
I am still using the old mapper, but hopefully I can solve this issue.

Thanks
Dominic