Serial Field
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This module provides an auto-increment (serial) field.
Unlike Drupal's built-in auto-increment node ID, which is global and shared by nodes belonging to all content types, serial fields are managed per content type (D6) / entity (D7). For example, the serial field of an Invoice instance will generate a unique sequential number (starting at 1, then 2, etc.) exclusively for Invoice instances.
The allocation of serial numbers by this module is atomic. In other words, the serial values are unique even when multiple instances of the same content type / entity are created simultaneously.

