Hi Andrew,
Thank you for your help in this matter.
A line from Property (5).csv used for import:
Name,Owner,File Reference,Street1,Street2,Street3,City,State,Postal Code
134 Hoold Lane ,,A379,134 Hoold Lane ,Preston,,Lancashire ,,PR5 5RE

In the screenshot, Instruction is equivalent to Job as previously mentioned.
The log error:
Separator is ','
Processing line 1 (134 Hoold Lane ,,A379,134 Hoold Lane ,Preston,,Lancashire ,,PR5 4RE )
First data: 134 Hoold Lane
Second data:
Line '1' : Error! No record (rav_property) was found with the value specified
Processing line 2 (,,A381,,,,,,)
In the example above, A379 is the Mapping Attribute that is common to both entities.