The following is the list of relevant SAP Notes, just to be sure you have complete list. Please make sure all SAP Notes are implemented completely, including manual steps.
2215270 Announcement note
2228198 Audit Function for Tax Authority - DDIC
2228197 Audit Function for Tax Authority
2249768 Audit Function - Error while running report NOTE_2228197
2239078 New infrastructure shared services and their components for
2239405 Hungarian Audit Report Core Components – DDIC
2239255 Hungarian Audit Report Core Components
2240111 Audit function for Tax authority - SD Integration
2244182 Wrong VAT total when invoices in foreign currency – DDIC
2243626 Wrong VAT total when invoices in foreign currency considered
2242017 Audit function for Tax authority - corrections and MM Integration
2249204 Shared business services for localization solutions
2244656 Audit Report: Correction of XML output
2249946 Incorrect ALV text symbols of the Hungarian Audit Report
2249770 Hungarian Audit Report - Real Estate Integration
2254108 Audit report: XML corrections and enabling the data selection from external invoice solutions
The new functionality also can be used by company code in other country e.g. Germany.
