Customer had defined the form stylesheet and added it to workflow task with handler EPM-display-form.
The Custom form worked as expected when the task was viewed in Viewer tab in RAC.
But in AWC the attributes defined as label appeared to be editable for Custom Form
SolutionThe issue was occurring because the customer had registered stylesheet with Stylesheet Type : Form for Custom Form.
Created a new(custom) stylesheet for Custom Form and registered it with Stylesheet Type : Save As this allowed AWC display the attributes defined in the Custom form as expected i.e. the label attributes were displayed as non-modifiable.
Notes