https://userapps.support.sap.com/sap/support/knowledge/en/3542251
3542251 - Data could not update to table via function mode BAPI_BUPA_FS_FISCYEAR_CHANGE2 | SAP...
Use BAPI_BUPA_FS_FISCYEAR_CHANGE2 to update data to table like BP021, data does not save to table and no error message generated.