When running server with system property org.jbpm.wb.forms.renderer.ext set to true, there's different rendering of Start Process modal shown by Business Central.

When user has generated forms in their project, project is built and deployed there is different rendering of the forms in Start Process modal:

• In default case when property is not active, there's an accordion element containing two sections: Correlation Key and Form.
• When this property is active, no accordion is shown and just plain form is rendered. It means there's no way to set Correlation Key in such case.