The Include In Budget Edit field only applies to income statement accounts.
Select Setup > Finance Enterprise Group > Maintenance.
Open a finance enterprise group and click the Chart tab.
Open a chart and click the Hierarchy tab.
To enable a posting level edit for an individual account, open an account
and select the Include In Budget
Edit check box.
To enable a posting level edit for all posting accounts in a summary, select a summary account and then select Actions > Set Include Budget Edit On Posting Accounts. Select Include and then click OK.