Shorewall users - Jan 2003 - Source-depending DNAT

I run Shorewall on a Bering router and need to do some (what I would call)
source-depending DNAT (Port-FW).

I want all incoming udp connections to 200.171.1.1:1111  from subnet
200.0.0.0/8 forwarded to 192.168.1.1:1111 (just an example).
All other iuncoming connections to 200.171.1.1:1111 I want to forward to
192.168.1.2:1111.

Could I do something like this???

ACTION         SOURCE           DESTINATION                PROTOCOL
DESTINATION    SOURCE                 ORIGINAL

PORT                    PORT                      DESTINATION
DNAT             net:200.0.0.0/8    loc:192.168.1.1:1111         udp
1111                       -                               200.171.1.1
DNAT             net:!200.0.0.0/8   loc:192.168.1.2:1111         udp
1111                       -                               200.171.1.1

I have no means to test the "net:!200.0.0.0/8" statement.

Many thanks for helping a "Shorewall-Greenhorn".

Juergen