https://userapps.support.sap.com/sap/support/knowledge/en/3617821
3617821 - Error message F5858 and 7Q321 in 'Create Supplier Invoice' app (app id: F0859) - SAP...
System error: Amount field is negative - F5858 Withholding tax amount exceeds the customer/vendor item amount 001 - 7Q321