Why is the system asking me to verify the columns of my BOM ?

Why is the system asking me to verify the columns of my BOM ?

When you upload your BOM file in myProto, you will be first asked to select the sheet where the BOM data are encoded. After the correct sheet is selected, the system will ask you to select the corresponding column headers of the uploaded BOM. This action is needed in order to precise to the system the correct selection of the columns and avoid any potential misconception. As minimum it is mandatory to select two columns:

1. Designators (preferred) or Quantity
2. MPN or SKU