I can't set 2 different APN for my 2 SIM cards

When i change the APN for one of my SIM, it automatically change in the other SIM to...
Now i'm on CM 13 unofficial, but i had the same issue on the hydrogen beta ROM.

(the sim cards are both vodafone, but one is web and the other is wap)

Any idea?:confused:

thanks!

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