Input type has to be the same as the current setting type, output type has to be a string.

For now the easiest way to create a new UvP string is to create one in HpD Studio GUI and then read and copy it in API.

Setting a valid external value formula will override (delete) Text and SymbolLibraryId property values.

This property is disabled when current decoration is not attached to a parent setting as the input depends on the attached setting type.

Reference

DecorationSetting Class
DecorationSetting Members
TextProperty Class
Text Property
SymbolLibraryId Property