Before running the VAT Return in the Run Compliance Reports app in SAP S/4HANA or SAPGUI report Advance Return for Tax on Sales/Purchases (RFUMSV00) in S/4HANA OP or ECC, you need to go through some settings.
You will find a step-by-step description of the necessary settings on SAP Help Portal as soon as the corresponding product version or Support Package has been released. Until then, please see the preliminary documentation that is attached as a PDF to the following SAP Notes 3102152 and 3112208 in SAP Support Portal.
Source: sap.com
