Add Systems signature to an existing ASM policy

Ok I think I got it now.

First if my doubt about the different results with my previous filtering example on Wordpress was because OS has available Wordpress signatures (Security ›› Options : Application Security : Attack Signatures : Attack Signature List) and they were not applied to the policy (Security ›› Application Security : Attack Signatures). Correct?

Secondly I succesfully managed to update the signatures applied to a policy without rebuilding from scratch. For the record:

1/ Go in Security ›› Application Security : Policy Building : Learning and Blocking Settings to update policy signatures applied and click on the Signature set to update:

2/ Do required changes including the name of Signature set and click Update (here only PHP for the example):

3/ Check changes

I think this make the trick thanks all to your help but do you validate this method?

Thank you very much!