In T-code OBBO you can create, if you are need, for every company code a posting period variant which must assign to company code - T-code OBBP. With OB52 you can determine for every posting period variant a posting period for every account type (A,S,D,K,M and +).
Important: In FI it is possibile only two period ranges have to be open at the same time, during of the closing procedure, one for posting period of fiscal year (1-12) and one for special posting period (13-16).
If my answer it is not sufficient, please give me a example for what you want to say with "to use multiple time zones".
The Last column in OB52 Screen for authorisation group.
I think this field can be effectively to restrict the posting by different users situated in different time zones. Of course if a user is travelling from one time zone to other, this option may not work unless authorisation group in his user Id is changed.
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