A billing sequence is a numerical value that is used to group items together when creating a valuation.
All the items with the same sequence number will be used to create a unique valuation by grouping currency, unique project and the billing sequence. Example:
| Currency | Unique Project | Billing Sequence | Group |
| USD | P1 | - | valuation group 1 |
| USD | P1 | - | valuation group 2 |
| USD | P2 | - | valuation group 3 |
| USD | P2 | 1 | valuation group 4 |
| SEK | P2 | 2 | valuation group 5 |