There are multiple errors in the radio frequency information for southeastern Norway.

The controlling frequency for Oslo TMA is given as "Oslo DIR" on 131.350. This frequency appears to be unused - it is not among the frequencies listed for Oslo TMA in AIP-Norway. The correct frequencies according to AIP-Norway should be "Oslo APP" on 120.450 in the western part and 118.475 in the eastern part. The nonexistent 131.350 is also given in the frequency list for Oslo/Gardermoen (ENGM) airport. There are other things in that list which I believe are suspect (e.g. the DEP frequency), but I haven't checked in detail.

Also, there are extensions of Oslo TMA and Farris TMA over Swedish territory, which have weird information. For sector Koster, the controlling unit is given as "ESFQ TWR" with no frequency. ESFQ is an uncontrolled airport below the sector!  For sectors Ørje 1 and Ørje 2, the controlling frequency is given as "Kastrup (!!!) APP" on 119.800.

I would recommend a complete overhaul of frequency info in this area.

Thank you for reporting this, I will ask my colleague who deals with Norwegian data to look into it.