Importer to Database error

Hello, every 15 days I use the importer app to upload a XLS file to my pipe in order to work on pending orders collection of customers. I have a database on Pipefy that has all the customer types/categories (let’s say “Customer A”, “Customer B”, etc.) 

Whenever I try to upload that file into Pipefy, I get an error message that the importer cannont overwrite the Database. The input from my excel file customer type column is exactly the same than the one in the database (i.e. “Customer A” in excel file = “Customer A” in DB registry)

I would appreciate any guidance on this. 

Thanks,

Chris