I have a custom multiple issue picker field shown in a transition screen. I want to validate this field before the transition is executed and prevent a value to be removed from it, in case a certain condition is not met.
I am already checking and doing further processing with the values which are added/removed from this multiple issue picker field in an Automation rule which runs when the field is changed but I cannot also validate and prevent the field change inside an Automation rule (because it happens AFTER the actual field change).
If I try to add my logic to a custom script in the workflow transition validator, I don't know how to access the "previous" value of this field, to be able to check whether the values which were removed are "complaint".
