You cannot revert back once the MMPV is intialized you can only allow back posting for one month in MMRV.
For reverting the Posting periods refer the below OSS Note it may help you..
OSS note: 487381
For period closing with initialization, the system displays a message saying that period closing cannot be started.
Before you start period closing with initialization, you must be aware of the consequences of period closing with initialization.This note describes the possible data inconsistencies that might occur if you carry out the initialization in a productive system.The resulting inconsistencies are not to be traced back to a system error but they are a result of the period closing program with initialization.
Hence, these inconsistencies can only be corrected within the remote consulting purchased separately since normally you no longer need to start the period closing program with initialization in a release > Rel. 4. 5.
MMPI, PIINKON, MMINKON, RMMMINIT, MMINKONH, history records, MARDH, MBEWH, MM016, MM 016
Reason and Prerequisites
The prerequisite up to Release 4.6C is the implementation of Note 369637.
In order to be able to have the period closing program running, you must reserve parameter ID MMPI_READ_NOTE with the current date in the user parameters with the current date in form YYYYMMDD (Y = year, M = month, D = day).
If you already need this additional security beforehand, implement the attached correction instructions and create SET/GET parameter MMPI_READ_NOTE.The SET/GET parameter belongs to development class MG and should have the following short text:
'Follow the instructions in Note 487381 before initialization '.
In addition, change message MM(016):
'Follow the instructions in Note 487381 before initialization'.
The SAP system works with the period concept of stocks.In the system, postings are updated precisely to the period.The inventory balances of the current and of the previous period are relevant to posting.As of Release 4.5, the history concept of the inventory balances has been introduced as an enhancement.
Bear in mind that the initialization of a posting period has the following effects concerning the period stocks:
The initialization of the posting period to a previous or to any posting period may lead to the loss of the information of the inventory balances of the previous periods.The book value of the current posting period is taken as the basis also for values of the previous period in this case.
If you want to continue working with this new posting period, in addition you should execute report Z_DEL_HIST_ENTRIES attached so that history entries greater or equal to the new posting period will be deleted.
If you have to briefly reset the posting period by one period (for example, postings must still be posted in a certain period) just to make a correction (and for a small number of postings), you should initialize the posting period back again to the old value so that the values of the previous period will not be lost (you should forbid postings when carrying out corrections).
However, afterwards the values of the previous period or the history records (as of Release 4.5) of the materials posted in this case are inaccurate.
You should NOT execute report Z_DEL_HIST_ENTRIES in this case.
However, if the posting period is generally reset again to a previous posting period and if postings were made during this time, all information on the inventory balance of the previous periods is lost.
As of Release 4.5a, you should use the cited correction report Z_DEL_HIST_ENTRIES in order to delete history records that are more current than the current posting period.Otherwise, it can result in deviations (inconsistencies) for the update of the history records.
Important! If there are open physical inventory documents that have status 'counted' or for which indicator 'Freeze inventory balance' has been set, you should reject these if they refer to a previous period or have been created in the former previous period.The inventory difference to be posted can be determined from the current book value of the previous period and the book quantity frozen in the physical inventory document (ISEG-BUCHM) and does not match the inventory balance of the previous period that is currently valid.
Please check Posting Date entered by User in MIGO ,user trying to post the document in November,2011(08/2011)
Please check requirement with user,why he requires posting in future period.
However you can open the period from MMPV for MM and OB52 for FI.