How to create a list of clients without SEPA-mandate (direct debit)

How to create a list of clients without SEPA-mandate (direct debit)

First post here - hi to everyone! Be gentle with me ;-)

I would like to contact all our clients without SEPA-mandate. 
I have used the client filter, client download as CSV etc., but I could not find a proper identifier regarding SEPA. 
What would be my best approach to solve this problem?

Kind regards,

Susan