3161111 - Unable to create an new DMN 1.1 diagram with my existing 'enterprise licenses'

I try to create a new DMN 1.1 diagram but can't find the option within the drop down menu. We are using an enterprise license. How can I make it work?

To create DMN 1.1 you will need an 'enterprise plus' license. This feature is not part of the enterprise license. Please contact sales@signavio.com for an upgrade.

KBA , BPI-SIG-PM-MOD-EDT , Graphical Editor for SAP Signavio Process Manager , How To

SAP Signavio Process Manager all versions ; Signavio Process Manager all versions