The configuration of the @PLUGIN@ plugin is done in the gerrit.config file. This plugin overloads Gerrit own DRAFT workflow. The WIP workflow can only be enabled, when DRAFT workflow in Gerrit was disabled.
Warning: When DRAFT workflow was used in Gerrit, i. e. changes in status DRAFT still exist, they must be published or deleted before WIP workflow can be used.
To disable DRAFT workflow the following must be set in gerrit.config:
[change]
allowDrafts = false
WIP workflow can be used now.