Missing data pane

I'm stuck trying to define business variables in our third assignment. The data pane is not showing up, so I can't access the pool variables. Only the General, Execution, Appearance, and validation panes appear. Do you have any tips to help me find the data pane? 

Thanks, 

 

Brianna Young

I believe dimitru's answer is the good one: https://community.bonitasoft.com/questions-and-answers/where-data-pool-variables-tab#comment-12487