Let us suppose you have validation in a transaction based on a project property and you want to use the value of this property in the validation message.
Add theĀ Logical validator to the desired workflow transition.
Add the following expression:
{"Insert the code for a certain Date Picker or Date-Time Picker custom field"} >= stringToDate(projectProperty("finifacturacion"), LOCAL)
The numeric value for the Date Picker or Date-Time Picker custom field depends on each Jira instance.
stringToDate()
projectProperty()