Lock table to be implemented for the target table also

I was going through the article,

https://community.appian.com/w/the-appian-playbook/2500/data-migration-to-new-schema

while moving the data from source table to target table getting the below error 

#1100 - Table 'tablename' was not locked with LOCK TABLES

Locking the target tables allowing the code to work smoothly. Please make the correction in the article.