Tax exemption for Service expenditure -CRM Service

Hi Everybody,

How to define a new tax type[none] for a service expenditure [ service] so that when we create service order service Product --> item category[SRVP] will have full tax & service expenditure -->Item category[SRVE] wil have zero[none] tax.

I have created Tax type -->NONE & assign it to Product Tax Type /Group.After that assgin that Tax Type in Product Master,then define it in TTE but after that also it's not working.

Please advice.

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Regards

Deb