On Field Update Set 48

Use this user property to check that at any time either the Discount Amount field or the Discount Percentage field has a value, but not both fields.

Property	Description/Value
Value	"Discount Percent", "Discount Amount", "IIf ([Discount Percent] IS NOT NULL, """", [Discount Amount])"
Parent Object Type	TNT SHM Quote Item business component
Usage	Checks that at any time either the Discount Amount field or the Discount Percentage field has a value, but not both fields.