Now that you have a PatientMerge table, the next step is to create a message definition to handle Patient Merge messages.

To create the message definition:

• In Chameleon, open the Message Browser.
• Copy and paste the following sample message into the top pane of the Message Browser.

MSH|^~\&|REGADT|MCM|RSP1P8|MCM|199601051530|SEC|ADT^A18|00000007|P|2.5
EVN|A44|199601051530
PID|||MR2||JONES^WILLIAM^A^JR||19501010|M|||123 EAST STREET^^NY^NY^10021||(212)111-3333|||S||ACCT1
MRG|MR1||ACCT1

	A copy of this message is available here: hl7_to_database_sample3.txt.

• Click Parse. You will notice that the MRG segment is not recognized, as this VMD file has not seen this segment before. (The MRG segment contains the patient merge information.)
• Click the Segments with red icons are unrecognized link (which is located in the yellow panel). The Import Unrecognized Segments Window appears.
• Leave everything in this window as is. Click Next, Next and Finish to import the MRG segment into your Workspace.
• In the Message Browser, click the Message is unrecognized link (again located in the yellow panel). The Create Message Definition Wizard appears.
• Click Finish. The Wizard creates a new message definition named PatientMerge, and defines the following message identity for it:

The Message Identity for the PatientMerge Message Definition

Now that you have a message definition, the next step is to set up the segment and table grammar for the message definition.