MIRO transaction without tax code

Hi,

Currently I am testing GST implementation scenario in Malaysia.

We have some PO before GST implementation but LIV is done after GST & companies without tax code.

As, I am doing LIV, system request to enter tax code but we are not suppose to enter tax code.

Please advise how could I overcome the situation. I need to post MIRO transaction without tax code for non GST implemented companies.