Maintaining Responsibility Role in Version 4.5B

[Stols, Nico]

I am experiencing difficulty maintaining a responsibility role in version 4.5B.
 
I created the role with a container element (cost center (csks-kostl) ) save it.  When I now want to create a responsibility the first popup appear where you insert he abbreviation, description and validity periods - but as soon as I enter through it - nothing happens it just go back to the previous
screen
 
Any help would be appreciated
 
Thanks
 
Nico