Multi access dynamic row level security

[Anonymous]

Hi, (Long explenation follows, with question in the end)

I have implemented row lavel security based on this table:

The logic behind it is that all my data belong to one "Kommune", and every "Kommune" belongs to a "Fylke".

- If i wirite something in "Kommune", for example "Stavanger" in row 16, and the beloning "Fylke" (here: "Rogaland"), I get data for only "Stavanger" kommune. 

- If I write "None" in "Kommune", but something in "Fylke", for example "None" and "Trøndelag" in row 14, I get the data for all the "kommune" belonging under "Trøndelag".

- If I write "None" in both columns, like row 15, I get the data for all "Kommune" in all "Fylke" that exists. 

The RLS is implemented like: 

var _RestrictionKommune=
CALCULATETABLE(
VALUES(RLS[Kommune]),
RLS[E-mail]=USERPRINCIPALNAME()
)

var _RestrictionFylke=
CALCULATETABLE(
VALUES(RLS[Fylke]),
RLS[E-mail]=USERPRINCIPALNAME()
)

Return
IF(
AND(_RestrictionKommune="None", [Fylke]=_RestrictionFylke), TRUE(),
IF(AND(_RestrictionKommune="None", _RestrictionFylke="None"), TRUE(),
IF([Kommune]=_RestrictionKommune, TRUE(), FALSE())))

This filters another table with the releationship between "kommune" and "fylke". The start of that table looks like this:

All other data is connected to this table. 

However, I want to give som users access to several "Kommune". How can I set up this?