Default Tax code in MIRO Header

Hi Experts,

We have a requirement of defaulting the tax code value in MIRO transaction based on the referenced Purchase order document type.

Ex. to illustrate:   If referenced purchase order document type is 'ZXY' then the Tax code should default to 'X3'.

Please let us know, if there is any BADI or Exit or any other way  through which we can achieve this.

Thanks in advance.

Regards,

Dixit