By carrying out analysis on the tax due, and supplementary data, we have been able to identify cases where the incorrect type of transaction was selected.
Drwy ddadansoddi'r dreth sy’n ddyledus, a data atodol, rydyn ni wedi gallu canfod achosion pryd mae’r math anghywir o drafodiad wedi cael ei ddewis ac wedi’i gywiro’n ddiweddarach.