Where used:

Attribute	ADDRESS ASSOCIATION TYPE	references in description POSTCODE OF CORRESPONDENCE ADDRESS
Attribute	POSTCODE	references in description POSTCODE OF CORRESPONDENCE ADDRESS
Class	GP REFERRAL REQUEST	references in description POSTCODE OF CORRESPONDENCE ADDRESS
Data Element	POSTCODE	is implemented by data element POSTCODE OF CORRESPONDENCE ADDRESS
Dataset	GP REFERRAL LETTER CMDS (deleted)	references in description POSTCODE OF CORRESPONDENCE ADDRESS