This is not a question. I just wanted to put two cents worth of my experience with a lookup table and a csv file. This lookup table was able to match some values from a field and not others. What I ended up discovering that one of the rows in the lookup table had an extra field and that was messing up every lookup after that. So if you have a csv file please open it in a spreadsheet and check to make sure that all the rows line up properly with the columns.
Example:
"Country_Code","Country_Name","Continent"
"CN", "CHINA","ASIA"
"ES", "SPAIN", "","EUROPE"
"UK", "UNITED KINGDOM", "EUROPE"
In the above example since SPAIN has an additional column any lookup after SPAIN will provide either a blank or a default value that you used in creating the lookup. This is strictly from my experience. I'll be happy to get feedback from others.
The same thing will happen if you have unmatched (unterminated) parentheses.