Message type: E = Error
Message class:  TU - Billing/Scheduling/Budget Billing 
Message number: 558
Message text: The reference from budget billing plan &1 to document &2 was deleted
There is a reference to budget billing plan &V1& in document &V2&. When
budget billing plan &V1& was deleted, the reference was also deleted.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message TU558 indicates that there is an issue with a budget billing plan that references a document that has been deleted. This typically occurs in the context of billing and financial transactions within the SAP system, particularly in modules like SAP IS-U (Industry Solution for Utilities) or SAP FI (Financial Accounting).
Cause: Deleted Document: The primary cause of this error is that the document (e.g., an invoice, billing document, or contract) that the budget billing plan is referencing has been deleted or is no longer available in the system. Data Inconsistency: There may be inconsistencies in the database where the budget billing plan is still trying to reference a document that has been removed. Incorrect Configuration: There could be configuration issues in the budget billing plan setup that lead to this error.
Solution: Check Document Status: Verify if the document referenced in the error message (document &2) still exists in the system. If
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