Default Supplier ID error on part import

[CWatson-Tactile]

I am trying to import a list of parts (.xlsx), and I keep getting this error (SupplierPart matching query does not exist.).
It works when I remove the 'Default Supplier ID' column, but I want to have the parts pre-associated with a supplier.

Is this the wrong field for suppliers?
I already have the suppliers added, and am using the suppliers 'ID #'

[CWatson-Tactile]

Forgot to add screen shots

[SchrodingersGat]

Probably what is happening is that the "Supplier" you have created in the system is not actually marked as a supplier. The is_supplier field must be set to True. Make sure that the supplier is configured correctly and then re-attempt the import

[CWatson-Tactile]

All of the suppliers are marked as 'is_supplier = 1'

[SchrodingersGat]

Ah, ok I see what is happening. The "default supplier" maps to a Supplier Part and not directly to the supplier. So, you need to import the supplier part information and after that you can set the "default supplier" field