Jekinsfile Changelist number doesn't get updated when using pipeline Script from SCM.

Perforce Software Polling Log

Started on 21.09.2016 08:47:00
P4: Polling on: master with:file-master-8.40_JenkinsFile
... p4 client -o file-master-8.40_JenkinsFile +
... p4 info +

P4 Task: establishing connection.
... server: wessslx4:1666
... node: WESSSSW
P4: Polling with range: 50845,now
... p4 changes -m100 //file-master-8.40_JenkinsFile/...@50845,now +
P4: Polling on: master with:master-8.40_JenkinsFile
... p4 client -o master-8.40_JenkinsFile +
... p4 info +

P4 Task: establishing connection.
... server: wessslx4:1666
... node: WESSSSW
P4: Polling with range: 50845,now
... p4 changes -m100 //master-8.40_JenkinsFile/...@50845,now +
... p4 change -o 50871 +
... p4 describe -s 50871 +
... found change: 50871
next change: 50871
Done. Took 0,29 Sekunden
Changes found