To each calculation group, add the calculation variables that you want to use:
To define formulas.
As scheduled unit.
Steps
Go to Project management and accounting > Setup > Advanced project management > Calculation groups.
Click Edit.
Expand the Variables section.
Click Add.
In the list, mark the selected row.
Click Add.
Click OK.
Note
Consider filling in these fields:
Default value: You can enter a default value for a variable. If you assign the calculation group to a work breakdown structure line, its variables with the default values are added as well.
Is scheduled quantity: If this check box is selected, the variable is the scheduled unit for the calculation group. If you assign the calculation group to a work breakdown structure line, this variable is the scheduled unit for the line. For each calculation group, you can only mark one variable as the scheduled unit.
Unit: You can link a variable to a unit. This is required if you use the variable in subcontracting
Notes
Make sure you only add the variables that you want to use. All variables, as added to a calculation group are, for example, shown in the Calculation section on the Work breakdown structure form. And it makes no sense to have unused variables shown there.
If a calculation group is only used to define a scheduled unit, you only need to add one variable.
If you use progress billing, mark a variable as scheduled unit. For progress billing, usually, the scheduled unit variable is a percentage.
If you use subcontracting, mark a variable as scheduled unit, and define the unit as well. Reason: subcontracting uses purchase orders, and on the purchase lines a unit is required.