Recordtype not found in process model properties at process start form

Hi all!

While working on Exercise 10 (Process Modeling 101, Part 1) I encountered an error in an expression in process model properties at process start form. It says "Neither variable(s) nor rule(s) found: recordtype".

Therefore, I cannot publish the interface. At this stage the Process Start Form contains "AX_AddVehicle" as an interface with 'vehicle' as Rule input, 'AX Vehicle (Record Type) as type and 'vehicle' as value. In Variables section the vehicle with AX Vehicle (Record Type) is also named. So I followed the instructures as the step-by-step exercise prescribes.

What could be the problem? The recordtype definitely exists. The previous work has been done without mistakes.

Thank you. 

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