User Exit Required for service PR

Dear All,

we are using USER EXIT COZF0002 for picking the seperate document type of PR and we are using filed as network profile

its working fine for materials but for service PRs same user exit not triggering .

my QNS is both material and service activity under the same network but it is picking for material seperate PR doctype but for service activity its picking NB.

please help...

Regards

venu gopal