When you update the policy in the kasp.xml file, you want to issue the following command to update the changes in the OpenDNSSEC database:

ods-ksmutil update kasp

If you want to force the changes to be applied, you can issue these commands:

ods-signer clear <zone>; ods-signer sign <zone>

Be careful with this and read the hints in the OpenDNSSEC documentation before.