Opening this issue for investigation:

When we have a workflow that uses a dataInputSchema that contains fields of type enum, the Dev-ui is not showing the corresponding form when we try to create a new insance.
However, in the swagger-ui we can see that the dataInputSchema is taken.

Is it expected that the Dev-UI should print the form when there are enum fields?

Steps to reproduce:

1) in the zip file we have a workflow wait-on-error that uses a dataInputSchema.
Unzip the file in a local directory and deploy the workflow using kn-workflow-cli

kubectl create namespace test2

kn workflow deploy --namespace test2

2) Go to the corresponding Dev-UI screen / workflows definitions list and try to create a new WF instance.
When the corresponding form is displayed an empty form will be shown. And the button to "submit" is not present.

However with the swagger-ui we can create instances and the validation works as expected.
Looks like "enum" fields are not being painted or produced an error?
This what needs investigation.

Other simpler forms works fine.