It is used by codeunit 408, DimensionManagement, when assigning a dimension set ID to a document, document line, or journal line. If a dimension set with a specific combination of dimensions and dimension values is not found, then a new dimension set is created.
List of Fields in the Table
To see the list of fields in this table, change to the Classic view. Choose the Choose View button in the upper-right corner, and then choose Classic.