TAXINN related

Hi

Any idea for some basic ideas about TAXINN and how different is it from TAXINJ.

In TAXINJ we create calculations schemas and attach these schemas to vendors. Then using FTXP we maintain taxes.

In taxINN how is tcode FV11 used and what role FTXP has.

Are there any material available w.r. to Taxinn.

Regards

Eldee