Tax is getting calculated in AR for Project Contract Invoice

Summary:

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Project contract Invoice is generated in Project billing and There is no Tax calculated as expected. (We have used "Exempt" Tax classification at the contract lines)

After the Invoice is imported to AR, The AR invoice is calculating Tax.

***we are using "Exempt" Tax classification at the contract lines and Tax donot get calculate in PJB and also in AR after transfer.***

For the same Contract, we already have 2 previous invoices generated previously.

For These two previous Project contract Invoices, There was no Tax calculated as expected at PPM and AR.

But, for this current invoice, Tax getting calculated in AR.