带有空值的 BOE Universe @prompt

BOE Universe @prompt with null value

我需要在我的 BOE Universe 的提示中有一个空值。我该怎么做?

@Prompt('Special Claims Indicator','A','Special Claims Analytics\Special Claim Type Code',MULTI,CONSTRAINED,,{' '})

当我将“ ”的提示值更改为 null 或“”时,我的错误是 Parse Failed: Invalid definition (UNV0023). Error parsing default values parameter (7th parameter)

我做了一些挖掘: "Note: you cannot use the operators NULL and Not NULL when creating prompted filters. " http://reports.is.ed.ac.uk/areas/itservices/busintel/TrainingMaterials/advUser/Lesson2-Step4.html