How to resolve CSKU missing error

To resolve Missing SKU:

• Click on 'SKU Missing' under the Not ready to fulfill list. 
• Click on the selected order. The order information page appears. 
• Click on 'Add CSKU' to add a CSKU. 
• Click on 'Update CSKU' button to add the CSKU

Note: Should the specific SKU has no stock, it will not be able to find the SKU from panel. Kindly perform product sync