You can decrease the effective period when you extend the start date. If you have a record version before and adjacent to the record version that you edit, a gap is created between the record versions. The

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extends the end date of the record version with which the gap is created to maintain contiguity.

You can decrease the effective period by moving the end date to an earlier date. If you have a record version after and adjacent to the record version that you edit, a gap is created between the record versions. To ensure contiguity, the

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moves the start date of the adjacent record version to an earlier date.

If you do not enable contiguity of records in base objects, the adjacent record versions remain unchanged.