The setting of a diagram property value requires the name of the property as the first argument and the value to set as the second. The property names are found in the saprops.cfg and usrprops.txt files.

Often the real name of a property is not the same as what shows up on a definition dialog; for example, in an Elementary Business Process of a Process Chart diagram, the Locations property is actually a rename; the real property is Location Types. You would only know this if you looked up the definition of an Elementary Business Process in saprops.cfg and saw that the property is actually called Location Types but has been labeled Locations":