In the Budget Scenario Definition window, in the Scenario dropdown list, you have selected a budget scenario and selected the accounts to define budget.

You have chosen OK.

From the SAP Business One Main Menu, choose  Administration System Initialization General Settings .

On the Budget tab, select the Budget Initialization option.

In the system message “Mark all P/L accounts as budget accounts?” choose Yes.

Choose  Financials Chart of Accounts .

Select the non-P/L account that you want to define budget and choose the Account Details button.

In the G/L Account Details window, select the Relevant to Budget checkbox.