[exim] acl_check_data discard, deny condition not working

Dear All,
I tried a deny condition in the section, acl_check_data :
acl_smtp_data = acl_check_data

acl_check_data
deny condition = ${if match{$h_x-spam-status:}{\NUNPARSEABLE_RELAY\N}}
log_message=....

The deny or discard condition does not work, but warn condition does:
warn condition = ${if match{$h_x-spam-status:}{\NUNPARSEABLE_RELAY\N}}
log_message=..

How can i get the deny drop message ,if special header is set, working?

Greetings
Daniel