Hello! How can I make a query (it would be based on an id introduced by the user in the start form of the process) to a record and save the value to a process variable, in order to use it further in the model?
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You pretty much described what you need to do. Is there a part you don't understand?
That would be a basic use case for a query using queryRecordType. This is covered by the Appian trainings and tutorials.