The project is used to monitor the cost of elements. This option is
applicable only if an element budget is available for the source
project.
Activity
The project is used to monitor the cost of activities. This
option is applicable only if a bottom up activity budget is linked to the
source project.
Note
By default, the element budget is used, if both the element
and activity budget are defined for the project. If the element or activity is
not defined for the source project, an error message is displayed.