Hello 
 
I am in process of building recruitment app as per book from " Force.com Platform Fundamentals - An Introduction to custom application development in the cloud" Version 9.2 Aug 2016.
 
https://resources.docs.salesforce.com/sfdc/pdf/salesforce_creating_on_demand_apps.pdf
 
I am on unit - 6 Page :143  and 144.  
 
Use the Import Wizard . I already downloaded and extracted Sample data CSV file as per page # 142
Url : https://developer.salesforce.com/docs/atlas.en-us.fundamentals.meta/fundamentals/adg_relationships_dl_sample_data_try_it_out.htm
 
Url : https://developer.salesforce.com/docs/atlas.en-us.fundamentals.meta/fundamentals/adg_relationships_import_wizard_try_it_out.htm
( I do not see Step-4 while importing Data )
 
Error Details after import of Job application.csv :
 
" 
"Id","Success","Created","Error"
"","false","false","INVALID_FIELD:Foreign key external ID: george@schnell.com not found for field Name in entity Candidate__c:--" "
 
 
Import of Candidates.csv went thru but import of Positions.csv and Job application csv failed. I am not sure what i am missing and i matched as per written on page 143 and 144. Also i observed that some of the steps mentioned on pdf book does not match with import wizard. I tried to use Data loader it does load all files but showing me unrelated values. Example : Position Name : a00f400001u