MT 564 Field Specifications
9. Field 13a: Number Identification: Linked Message
FORMAT
 Option A | 
 :4!c//3!c | 
 (Qualifier) (Number Id) | 
 Option B | 
 :4!c/[8c]/30x | 
 (Qualifier) (Data Source Scheme) (Number) | 
PRESENCE
Optional
QUALIFIER
(Error code(s): T89)
 Order | 
 M/O | 
 Qualifier | 
 R/N | 
 CR | 
 Options | 
 Qualifier Description | 
 1 | 
 O | 
 LINK | 
 N | 
   | 
 A, B | 
 Linked Message | 
DEFINITION
This qualified generic field specifies:
 LINK | 
 Linked Message | 
 Message type number / identifier of the message referenced in the linkage sequence. | 
NETWORK VALIDATED RULES
Number (Format Option B) must not start or end with a slash '/' and not contain two consecutive slashes '//' (Error code(s): T26).
USAGE RULES
Format A Number Id must contain the FIN message type number of the linked message.
Format B Number must contain the XML message identifier of the linked message.