Different material tax classification for same material & same plant

Hi Gurus,

Here is a scenario I have-

We have 2 plants in Japan, A & B, both are linked to Sales org A & B respectively, material X sold out of Sales Org/ Plant - A for a customer 100  needs to have tax rate of 8% and same material X sold out of Sales Org/ Plant - B for same customer 100 needs to be tax exempt. the problem in this scenario is that tax classification are maintained at country level which means that material tax classification cannot be set at plant/ sales org level, and tax classification for customer is same for both can anyone suggest how can we go about it?

regards

Anmol