Budget period was changed from &1 to &2

What causes this issue?

Before the account assignment derivation is called, the line item gets a
budget period. This does not match the budget period derived from the
account assignment derivation.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.