That conflict is between the codepage of your datasource and that of the (temporary) destination table.
My client has a dictionary table. They're defining a list of standard naming convention. Now, they are requiring my team to provide us a mechanism how to match new incoming data with existing data in their system.
Here's a requirements document template for an integration project (also known as Extract-Transform-Load or ETL) based on my development experience as an SQL Server Information Services (SSIS) developer over the years.