Pricing question - Condition exclusion

Hi,

I have a question on pricing especially condition exclusion:

I have 2 condition types, ZELP and ZSPK both are surcharges and has statistical indicator on it.. My scenario is: ZSPK had higher priority, so If there's a condition record for ZSPK then use ZSPK and ZELP should not show up on Pricing. If no record for ZSPK then use ZELP.

I am thought of condition exclusion, so I maintained ZSPK and ZELP condition group and assigned respective Condition types to it and assigned these condition types to pricing procedure. I used indicator D = 'Exclusive'.

1 D- ZSPK - ZELP.

I maintain condition records for both ZSPK (6 $) and ZELP (5.5$).  Now I create an order an I check in condition tab, I see that both ZSPK and ZELP is getting displayed and ZELP is getting applied as pricing.

As per condition exclusion settings, ZSPK should have appeared in conditions.

Can you help me out what could be wrong or suggest some scenario to achieve it  ie..If there's a condition record for ZSPK then use ZSPK and ZELP should not show up on Pricing. If no record for ZSPK then use ZELP.

Thanks

Nidhish