Well, why can't you have 13 additional versions - say call them P00, P01, ..., P12, You budget your original budget in P00 and copy it to version 0 and freez P00. Perid 1 revised budget is in P01 and you copy it to version 0 in period 1 and then freez version P01, so on and so forth. AVC ledger 9H only has version 0 but all versions are saved to ledger 9F. That is why you'll need to copy revised version to version 0.
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