WAF Policy with WAF Security Profile - Webfilter Violation

Hi,

we would like to protect our web service with WAF profile but activating WAF in the policy we get a webfilter violation error message and we can only activate withou SSL inspection which makes no sense. 

Than we tried to import our wildcard certificate as local certifcate to use in SSL/ SSH Inspection just to find out that without a CA certificate we cant use it for our policy. 

Any suggestions how we can get WAF profile running in proxy mode for our VIP?

Thanks!