SAP Message 3F791 - You cannot use this function for the current budget status

Diagnosis
The budget status determines which actions you can perform for thebudget units in the budget structure. The following statuses aresupported:
'1': the budget has been released and can no longer be edited.
'2': the budget has the status "planned" and can be edited (thisdepends on your authorizations).
Note:
To assign another budget unit to your budget unit, both budget unitsmust have status '2'.