Discounts a Standalone Price of a Product Variant on a published Product.
If the Product Variant does not exist or if it exists only in the staged representation of a Product, an InvalidOperationError error is returned.
Produces the [StandalonePriceExternalDiscountSet](ctp:api:type:StandalonePriceExternalDiscountSetMessage) Message.
Discounts a Standalone Price of a Product Variant on a published Product. If the Product Variant does not exist or if it exists only in the staged representation of a Product, an InvalidOperationError error is returned.