Issue with Tax Condition Types & Tax Codes

Hi Xperts

We have created two new condition types for two Taxes.Now we have seen that wherever we are not using those Condition Types(for example V0)  or wherever these taxes are not applicable,  automatically system calculates those tax amounts & then shows it on the Print Preview.

The surprising case is , this is happening for 1/2 cases out of 10 cases.Could you pls guide where we were wrong.We are using Z-output type to print the Purchase Orders,

Rgds

Soumick