failure: only one area is allowed to be NSSA translator... What?

So I’m trying to make a Mikrotik RouterOS 6.40.8 a 7/5 translator for two NSSA zones for which it is an ABR.
And it won’t work for me: whenever I try to change the type of the other zone to NSSA, it rejects my command with the following error message:

[admin@R1] /routing ospf area> set 3 type=nssa
failure: only one area is allowed to be NSSA translator

What’s happening? Is that a limitation of RouterOS?
Please see the picture which describes what I’m trying to do:
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mikrotik_ospf_75.png

Did you get it solved?

No, i included R4 and R5 in OSPF eliminating redistribution (and nssa) altogether.