You fieldname LOCATION should be same as the fieldname in the table. Its case sensitive nad hence the location should be in capital at both the places.
You can try out this. Comment the Section Access and Section Application from the code
// Section Access; comment this line
LOAD * INLINE
NTNAME, ACCESS, LOCATION
DOMAINNAME\NATHAN, USER, CAPE TOWN
// Section Application; comment this line
When you load this data the above table should link with your Location master table on the basis of LOCATION only.