vCAC Form in Advanced Service is not filled with the vCO Return

After migration from internal (vCAC 6.0.1) to external vCO (5.5.2.1) a vCAC “Advanced Services” – “Ressource Actions” does not displays the return of the vCO Workflow in the vCAC form.

When I run the vCO Workflow directly in vCO the Return is visible.