You can increase the effective period when you extend the end date. After you extend the end date, the record version that you edit can overlap with an adjacent record version. The overlap is with a record version that is after the record version that you edit. The

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extends the start date of the adjacent record version. To ensure contiguity without the overlapping of record versions, the effective period of the adjacent record version decreases.

You can increase the effective period when you move the start date to an earlier date. After you move the start date, the record version can overlap with an adjacent record version. The overlap is with a record version that is before the record version that you edit. The

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moves the end date of the adjacent record version to an earlier date. To ensure contiguity without the overlapping of record versions, the effective period of the adjacent record version decreases.

If you do not enable contiguity of records in base objects, the adjacent record versions remain unchanged unless there is a record version overlap.