When there are time phased costs (resource assignments) associated with a work package, and you change one or both work package requested baseline dates, the time phased data (costs) needs to be respread.
If there are activities linked to the work package and you choose not to respread, the budget will be respread by the integration that is run after the modeling session.
The respread process uses the following guidelines:
If the dates change but the number of periods remains the same, the previous profile is adjusted to align with the new dates and is re-rated. However, if the new dates span a different number of periods, the system aims to replicate the existing curve within the new dates. This process may lead to either stretching or shrinking the curve, depending on whether the number of periods increases or decreases.
If you choose to respread within the Change Details view, the respread process described in the first bullet is performed.
If you choose not to respread and navigate to the Costs tab of the Change Details view, additional periods are included in the spread. This allows you to manually input the new time-phased amounts. However, if the spread contains fewer periods than the existing time-phased data in the change class, those spread periods will be removed, potentially altering the total resource amount.
If there are no activities associated with the work package and the work package dates are manually adjusted, you will be prompted to decide whether you want to redistribute the budget. If you choose No, the dates are reverted. If you choose Yes to respread, the existing budget and added resources are respread over the remaining periods to the work package finish date.