To be configured properly, HL7 field specifiers must meet the following requirements. The value in the HL7 Field Specifier field must match the HL7 code in the HL7 message. The expected location of the HL7 code must be configured one of two ways: Using a chart field override on HL7 message templates Using Chart Data Field Configuration An HL7 field specifier must provided for any component that contains the HL7 Field Specifier field.