This setting is found by selecting the ‘Control Settings’ icon on the Budget Wizard - Setup ribbon. The form provided (when this icon is selected) has two options one of which is ‘User Settings’.
If you select the ‘User Settings’ option, the following form will display which will notify you of your current settings in regard to ‘Automatic Funding Adjustment’ and ‘Restricting Budgeting for Grouped Resources Lists’:
Call Budget Calculation Extension
Select the check box to enable the draft budget calculation extension prior to ‘Project Family Pack M’.
Prior to Projects Family Pack M you needed to enable this, in order to fire any Budget Calculation extension that your company has implemented. It is left off by default as this extension is not often used. The extension is called after the draft budget is created/modified.