Pmnt budget: No assignment object defined for &1 / &2 / &3 / &4

What causes this issue?

In FM area &V1&, the combination of fund &V2&, funds center &V3& and
commitment item &V4& in the <DS:GLOS.budget_structure>budget
structure</> does not have a superior assignment object in the payment
budget.
If you have defined only one assignment object in the payment budget in
the budget structure, you must create the assignment objects in the
payment budget in such a way that every assignable element has
precisely one assignment object in the payment budget on the path to
the top.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Define a superior element in the budget structure or the
<DS:GLOS.budget_structure_element>budget structure element</> itself as
the assignment object in the payment budget.
Check your definition.
Run reconstruction of the assigned values for the fund and the year in
which you have changed the assignment object definition.

Error message extract from SAP system. Copyright SAP SE.