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You can specify an automatic numbering pattern for generating individual record IDs for custom objects. A pattern can consist of a combination of the following elements:

The date when the project is created

A sequential number, which differentiates a particular project from the other projects created on the same day

Any static information, such as a department name or special characters used as format separators

If you change the auto numbering pattern of an object definition, any existing records keep the previous unique identifier conventions until users update the records, at which point the new auto numbering pattern is used.

Updating the auto numbering pattern does not count as updating the object definition, so record locking is not enforced. However, updating other fields of the object definition causes an optimistic locking error.

The following table describes the auto numbering pattern settings.