What version of Planning are you using? You should be able to set the security on year and city. Is this what you are proposing?
If you are in PBCS then you have valid intersections.
Not this applies to user input, not to business rules and not in reporting.
We are using version 22.214.171.124 Note that I know how to make Year and City read only separately, but not together and only them read only. For example I want the combination of 2015-17 and Berlin locked for editing while Dublin is write-able 2015-2017 (and all other cities have similar rules).
I appreciate the help.
Robert already provide you the correct answer.
Valid intersection is only out of the box if you are on cloud(PBCS or EPBCS) not Hyperion Planning.