In the Workstation, when selecting the DELETE method in the REST step, the Content tab is greyed out.
See the following screenshot:
<Please see attached file for image>
Selecting a different method like GET, POST or PUT allows the Content to be specified.
But in some cases this is also required for the DELETE method.
This required functionality is not available in the GA product.
A patch is available for DevTest 9.1, 9.5.1 and 10.0.
Please, open a support case and mention DE231794 and DE378035.