Hi David,
There isn't necessarily one for "Read Only", but "Hidden" will prevent a user from editing it. The hidden flag hides the field from the form view, but still exports the field to Blue Prism.
Let me know if you have any questions.
Thanks
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Ben Lyons
Product Consultant
Blue Prism
UK
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Ben Lyons
Principal Product Specialist - Decipher
SS&C Blue Prism
UK based