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How can I control whether the @Db Function returns a list?
If the @DbLookup key is valid for multiple documents, it will return a list. All @DbColumns will return a list (unless there is only one value in the Lookup View). If you want to return only one value, use
@Subset(@DB Function; 1)or
@Subset(@DB Function; -1).
If you want the @Db Function to return a list to a field, make sure that "Allow Multi-Values" is checked ON.