Tax Amount to be included in the Item value at GRPO level

Hii All,

I want the Tax amount to be included in the Item value at the GRPO level. Currently, we are using the "Non-deductable %" feature of Tax code settings to get this effect happen at the A/P Invoice level.My client insists this effect to happen at the GRPO level itself.Please suggest a way out.

Regards

Sree