How to use old tax percent(5%) and new tax percent(6.1%) of same tax rate in invoice

Summary:

How to use old tax percent(5%) and new tax percent(6.1%) of same tax rate in invoice 

Content (please ensure you mask any confidential information):

We have a tax rate "XYZ VAT" with 5%, now this needs to be changed to 6.1% effective next month. This can be achieved by updating the tax rate.

However, supplier sent an invoice which contains outstanding invoice lines with current month(which needs to use 5% VAT)

and also lines with next month for prepaying the rent(which needs to use 6.1% VAT). User wants to create this invoice in payables in current month and make payment asap.