responding to a decision of any court or tribunal which affects, or may affect, the operation of any of the Welsh Tax Acts or regulations made under those Acts.
ymateb i benderfyniad gan lys neu dribiwnlys sy'n effeithio, neu a allai effeithio ar, weithrediad unrhyw rai o Ddeddfau Trethi Cymru neu reoliadau a wneir o dan unrhyw un o’r Deddfau hynny.