Suppose that all the messages you will be receiving from Magic Health Systems use the same Hospital Service, CARCEX. You can use a Python script to specify this value as field 10 of the PV1 segment. This ensures that all parsed messages use this value. (As previously stated, as long as the table grammar, tables and messages stay the same, most of the other components can change, including segment Python scripts.)

To define this constant value:

• Double-click the PV1 segment in the Workspace. The PV1 segment definition appears.
• Locate Field 10 - Hospital Service.

PV1 Segment Definition, Showing Hospital Service Highlighted

• In the Inbound Script column, click the ellipsis button. The Editing Script window appears.
• In the Editing Script window, type value = "CARCEX".

Defining the Constant Value

This completes all the changes you need to make to the VMD file.