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Duplicate Checking for Form Properties

Question asked by billbert on Feb 9, 2012
I am using Activiti Explorer 5.8.  I have one form property (orderID:Integer) that user users enters when they start the Process in Activiti Explorer.  I wanted to add the following functionality and was hoping to do it within Explorer's capabilities.

1) Validate the orderID against a list of valid Id's that are in the table.
2) Make sure a process hasn't already been started for the orderID entered on form.

Can this be accomplished using Activiti Explorer and Activiti Designer?  If so, please provide some direction.