These five terms are often confused, but mean different things:
Cost — what actually goes into the final forecast. This is the internal, real figure. On a Change Order Sub, the cost counts in the final forecast regardless of status.
Cost price — what is shown/sent to the client. By default, cost price + surcharge equals the income requirement, but the cost price does not have to equal the cost — sometimes, for strategic reasons, you do not want to show the real cost to the client.
Cost claim — what has been notified/received from the subcontractor. The cost claim does not affect the final forecast directly; the amount in Cost does. When the change is set to Approved, Cost is set equal to the cost claim. When it is set to Rejected, Cost is set to 0.
Income requirement — correspondingly, what you have claimed/notified towards the client, but not necessarily what you end up recording as income.
Income — what is actually recorded in the income forecast. It can be set lower than the income requirement, e.g. if you are unsure whether the entire claim will be approved, or want a more cautious forecast.
By default, cost price + surcharge = income requirement = income, where the surcharge is an amount in NOK. You can override this manually in each individual case.
The back-to-back principle
When a Change Order Sub is approved, AIMZ suggests the same status and amount on the linked Change Order Client (back-to-back). The income then follows cost + surcharge, unless you have chosen a fixed price. You can choose whether to pass the cost claim or the actual cost through to the income side. See Fixed price on a Change Order Client.
Can I pass through only part of a contract/change order?
Yes, but note the approach: adjust the surcharge rather than overwriting the cost price directly. If you overwrite the cost price manually every time, you must remember to check that it is still correct — using the surcharge is more robust over time.
If a change you pass through to the client is already included in another change order towards the subcontractor, you typically set the cost to NOK 0 on it — so that it is not counted twice in the final forecast.
See also Change Order Client and Change Order Sub.