"Do you have something for me?" (Double dative?)

[Plumps]

well yeah but thats because Many German prepositions cause noun case change, typically to dative or accusative. in na'vi, the opposite is true: prepositions cause the noun to have No case.

ngaru tìyawr nìlun, ma 'eylan...

But that makes it sometimes a bit difficult for some German speakers to understand the case endings in Na'vi... e.g. ayeylanur oeyä etc. In German this is an meine Freunde (which is accusative )

But BTT

[Blue Elf]

Language is not bound by formal logic.   I can easily name you languages which not only allow double-datives (or double-accusatives), but require them in certain constructions.  My college Latin teacher called one "the dirty double dative."
Unless Pawl says it is forbidden, I would avoid saying it's not possible, especially given how many things the dative is used for in Na'vi.

OK, got the message
_{off topic}
But those identically case marked constituents must be bound by some other rules - word order, combination with another part of the sentence etc... I hardly believe that truly independent, identically marked (thus interchangeable) constituents, can be used in meaningful sentence.
^{/off topic}

What rule works in languanges:
- what is not prohibited (by known rules), it is allowed
or
- if something is not allowed (not defined by known rules), it is prohibited?
I tend to agree with Tanri - until we get rules from Paul

[Tirea Aean]

it's always safer, imho to assume it's not allowed until proven that it is. (yet nume = vtr. is something that has been practiced SO often, i thought for SURE it was until I looked. O_O)

of course I won't shoot someone down on reaching out on faith if something has not been defined by a rule. I will just say, be careful what you learn, because if it turns out differently than you thought, you have some UNlearning and RElearning to do

[wm.annis]

Voilà: http://forum.learnnavi.org/language-updates/i-have-something-to-say/

[Tirea Aean]

and so it stands: hunch of OP is correct.