Taxes don't get open in PO

Dear expert

I have maintained condition record for condition types.

Here my requirement is I need to maintain condition record only for these condition type

JMOP, JMX1,JEC1, JSEP, JEX1 and JHX1. I created condition record but the tax code scree is not getting open in PO invoice tab. But I maintained condition record for one more condition type JEC2, actually which is not required. Then tax tab getting open in PO.

Now I need to avoid condition record for JEC2, if I do such a way, tax code screen not getting open.  what to do?  Please suggest.

Regards

karan