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You need to upgrade your accounting data in 11i to the XLA tables in R12. Only after this you will do any adjustment to 11i data. At the time of initial upgrade, normally a few period of data (normally a year's data) is upgraded. After this, the remaining data is upgraded on periodic basis. The time taken for upgrade depends on the volume of the data. Please refer to metalink and upgrade guide for further details on this.
Hope this helps.