Filter records for Match code generation

Hi Experts,

I have successfully installed and configure the SAP DQM SP05.

Now client has a requirement where they want to filter customer for which match codes will be created.

The filter should be based on field "Central sales block for customer - KNA1-CASSD".

Now client wants to filter these customers. So when user tries to create a new customer, these customer should not appear as a probable duplicates.

Please help.

Thanks,

Rahul Doshi