This is a common error that comes up during the development of an HL7 interface. This error means the message you are receiving has a group of segments that do not correspond to the segment grammar defined in Chameleon for that message. To avoid these types of errors, you need to look at the message you are trying to parse and the message segment grammar definition in Chameleon.

For example, if the ADTA01 message has the following segment grammar:

MSH 
EVN 
PID 
[PD1] 
[{NK1}] 
PV1 
[PV2] 
[{DB1}] 
[{OBX}] 
[{AL1}] 
[{DG1}] 
[DRG] 
[{   PR1 
     [{ROL}]
}] 
[{GT1}] 
[{   
   IN1 
   [IN2] 
   [IN3]
}] 
[ACC] 
[UB1] 
[UB2]

where the square brackets [ ] represent an optional, and the set brackets { } represent a repeating segment.

Let's say that the message you're receiving has the following format:

MSH|^~\&|||||||ADT^A01|
PID|||ID|^^^^MaritalStatus|FamilyName^GivenName^^^Title|Driver||||
ZID|AS6353435
PV1| 

As a result, the sent message is missing the EVN segment and has an additional, user-defined Z-segment called ZID. This violates the defined segment grammar.

To correct this you can either:

• Ask your counterparty to send the EVN segment after the MSH segment and not to send the ZID segment; or
• Change the segment grammar of the message to make the EVN segment optional and include an optional ZID segment after the PID segment; or
• Ensure the Ignore Segments not in grammar option is checked in the Segment Grammar panel.