How to remove VAT tax in India Localisation?

Hi Team,
Could you please guide me about how to reverse the VAT tax in India localization?

Issue details: -
Business had raised invoice with short amount so they changed the invoice amount but tax amount not get changed , so business need to know how to remove VAT tax amount from invoice created ?

Thanks in advance..!!

Additional info: -

It's Manual invoice created for ASSET TO BE TRANSFERRED TO XXXX

Thanks,

Prabhanjan