SKUs are immutable in Zentail. Once a SKU value is saved in Zentail, it cannot be changed.
A work around would be to:
- Create an Alias of the SKU
- Give the Alias the updated SKU name
- Archive the Original SKU
- Un-alias the alias SKU
See this FAQ for assistance with those steps:
Cloning a SKUYou will now have a new SKU with all the same information as the original.