I cannot think of an easy way for doing that, however, this is possible:
- Make your field r/o for all states except destination one (<WHENNOT field="System.State" value="YourState"><READONLY/></WHENNOT>). This will make it editable only in a certain state
- Make your field r/o in all transitions into that state excluding the transition where you want this field to be editable.
This should work - your field will be editable only in a certain state - and a certain transition occured.
Thanks,
Alex
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