There are certain hardcoded fields, which can't be edited or changed using a standard bulk edit file and they would require Force to be checked before the file is uploaded for processing. Please bear in mind, that if you would be forcing new values in for any of those headers for products, it is strongly recommended to trigger an export of the current product data before the changes, so that would be a backup file since those values are essential for any inventory updates and communication to the channels and please see the list and details below:
General:
- sku
- guid
- iskit
eBay:
- ebayid
- ebaysku
Amazon:
- amznsku
Bigcommerce:
- bigcommerceskuid
Magento:
- magentosku
SkuVault:
Walmart
- walmartsku
You can also download a file with the most common headers here.