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Question: 
How can I ensure a field has been entered in a workflow Task before a user can confirm the decision?

Answer: 
From the DocuWare Workflow Designer, navigate to the workflow Task in question. Once there, go to the Decisions Validation section.
Check the box for "Enable data input validation," then use the following Condition; 

!IsNull(Workflow Field) 

Where Workflow Field is the field that is listed in the "Workflow Fields" section in the Conditions window.
NOTE: This will not work if you choose the field from the "Index Fields" section. 

Alternatively, from the Task Configuration's Dialog section, click on the icon to the right of the field to open its properties. 
From here, you will be able to check the "Required" option to make filling out this field required as well.

KBA is applicable for both Cloud and On-premise Organizations.