Windchill RV&S Item ID designation. Acceptable values include:
  :none // Indicates no change packages are used for check in
  :bypass // Assumes that the user has administrative privileges to bypass change package policies configured for the Windchill RV&S Project
  0 // Same as :none above
  12345 // An actual valid Windchill RV&S Item ID that the plugin will use to create a change package