Nov 23, 2015 - 06:34 AM
It goes in SCE's "Part Number".
In more detail: You choose your own SKU's.
SKU stands for Stock Keeping Unit.
It's your own identifier for each distinct item you have for sale in your inventory. For example, if you have Canon 60D DSLR Camera's in your inventory for sale you could make up your SKU for identifying them in your inventory like "CDSLR-60D" etc.