Transfer property value to request header in next step.
Hmm, really frustrating for both.
Select test case name, and select custom tab and add property as mentioned and leave value blank (a Property Transfer step is going to write value for this )
Step 2 : Go to Property transfer step, make the changes as suggested in the image i.e., Select the test case for the target drop down and Select the Property name
Then remove the tem_property test step