Alt Tax Classification getting copied from Billing Doc to Order

Hi All, 

I person a tiny query, I person created a caller bid benignant which volition beryllium created wrf to billing papers and caller payer volition beryllium changed successful this order, present the contented is erstwhile one make income bid wrf to billing papers alt taxation classification is getting picked up from billing papers header and adjacent erstwhile one alteration the payer alt taxation classification isn't getting blank.

Can you delight archer maine however tin one execute this due to the fact that caller aged payer taxes are being copied for caller payer also.

I person cheque transcript power and haven't recovered anything.

I volition truly admit immoderate benignant of help.

Thanks

@moazzam_ali