Transaction control header numbers assigned by the operational business process are typically degenerate dimensions, such as order, ticket, credit card transaction, or check numbers.
These degenerate dimensions are natural keys of the "parents" of the line items.
For example, retail point-of-sale transaction numbers tie all the individual items purchased together into a single market basket.
[2]Although most writers and practitioners use the term degenerate dimension correctly, it is very easy to find misleading definitions in online and printed sources.
You can use the data in the degenerate dimension to limit or 'slice and dice' your fact table measures.