Heidi,
One other option is using a new feature added in EHSM 3.0 SP03. As per the release note "the incident management application is enhanced to toggle visibility of incident UI elements (tabs or sub-tabs) depending on the role of the logged user. ". It is configured in the IMG and thus avoids need for development. see the following in the IMG "SAP EHS Management -> Incident Management -> General Configuration -> Assign Access Level to Tabs". Note that in SP03 most of the defualt config is missing and you need to use note 1849057 to provide the default settings. Regards, Michael