Derived table referencing DUAL table in BW

Hello Experts,

I appreciate your help in advance... I struggling creating a derived table referencing DUAL table in the unvierse. I am building universe on SAP BW multi-provider so objects syntax looks like ~@catalog('connection')."PUBLIC"."0FACT".

Tried following ways with no luck...

select 'QTY' as FACT_TYPE from DUAL

union

select 'AMT' as FACT_TYPE from DUAL

'and'

select 'QTY' as FACT_TYPE from @catalog('Connection')."PUBLIC"."DUAL"

union

select 'AMT' as FACT_TYPE from @catalog('Connection')."PUBLIC"."DUAL"

I am looking for any advice or solution.

Thanks

Ravi