Excise duty exemption against project authority certi. (pac)

Dear All,

Our Company received PAC from the party to whom material will be supplied.

Now i want to know, how to consider PAC while preparing Invoice. and whether we should not charge Excise Duty while preparing Invoice. ???

Our company is manufacturing company. Now we want to prepare Invoice without considering Excise Duty.

Is it correct not to charge Excise Duty because of PAC received ???

Please Reply Soon.

Thanks.

ImRaN Mansuri.