Confirm a tax code is deductible or non-deductible

Hi friends,

I need to post jv upload using Bapi_acc_document_post.

so for this I need to calculate the tax amount manually.

But before that I need to confirm the given tax code is deductible or non-deductible. So Please tell me how to confirm it.

In tcode FTXP it's given for a particular tax code the deductible tax rate. But while coding we can't use it to determine whether the given tax code is deductible or not.

So any alternative way that can confirm me whether it's deductible or not.

Please reply in urgent.

Thanks in advance,

Sanjeev