Query – Mapping Ebay Field to WooCommerce

Hello. We are trying out this plugin on a free trial and so far it looks great! I have a question about Ebay product identifiers. My colleague has been adding our product identifier to Ebay’s Reference OE/OEM Number rather than the usual fields e.g. UPC/EAN/ISBN. Is it possible to map the WooCommerce field SKU to the Reference OE/OEM Number? I cant find a way of doing it. It seems to only allow mapping to UPC/EAN/ISBN