If not checked, Chameleon will generate an error if a message contains a segment that is not defined in its segment grammar. If checked, the additional segment will simply be ignored.

To ignore/not ignore segments:

• Double-click the message's Message Grammar. The Message Grammar window opens.
• At the bottom of the Segment Grammar panel, check Ignore Segments not in grammar.

Checking the Ignore Segments Not in Grammar Option

	Using the Ignore segments not in grammar option is a very useful feature. For instance: No interface should reject messages that contain extra site-specific Z-segments. Interfaces that can tolerate extra and previously unknown segments are more likely to continue working when your counterparty upgrades their HL7 implementation. This makes for less work and less interface downtime.