2152442 - FB02 F5 350 as error instead of warning

At transaction FB02 you expect F5 350 "Account type/account for invoice reference does not match item" as a warning, however it is displayed as an error.
For business reasons (there is a legal succession for some customer or vendor), you want to reference some credit memo to a different account of the same account type.

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SAP ERP 6.0 ; SAP ERP Central Component 5.0 ; SAP ERP Central Component 6.0 ; SAP enhancement package 1 for SAP ERP 6.0 ; SAP enhancement package 2 for SAP ERP 6.0 ; SAP enhancement package 3 for SAP ERP 6.0 ; SAP enhancement package 4 for SAP ERP 6.0 ; SAP enhancement package 4 for SAP ERP 6.0 on SAP enhancement package for SAP NetWeaver 7.0 ; SAP enhancement package 5 for SAP ERP 6.0 ; SAP enhancement package 6 for SAP ERP 6.0 ; SAP enhancement package 7 for SAP ERP 6.0 ; SAP enhancement package for SAP ERP 2005

FB02 F5 350 displayed as error despite customized as warning, F550, OBA5, T100S, T100, MESSAGE E350,  SAPMF05L, Displaying/changing documents, Document Display/Change Module Pool, MF05LI00,  RECHNUNGSDATEN_KOPIEREN, RECHNUNGSDATEN_TESTEN,  rcode 20,  SAPFF002, WHEN 22, CALL FUNCTION 'CUSTOMIZED_MESSAGE, Number of the Invoice the Transaction Belongs to, Inv.ref., Invoice ref.                            , KBA , FI-AR-AR-A , Posting/Clearing/Special General Ledger , FI-GL-GL-A , Posting/Clearing , Problem