BI PLACEHOLDER with substring

Hi,

I'm creating a BO universe on a SAP HANA Calculation View that is using a Input Parameter.

I have a business requirement to always fill on this Input Parameter the current date.

I'm trying to create the PLACEHOLDER command on IDT like this:

('PLACEHOLDER'=('$$INPUT_FROM$$', SUBSTRING(to_char(current_Date,'YYYYMMDD1),0,6))

And I'm receiving an error: SQL syntax error: incorrect syntax near "SUBSTRING"

Anyone knows if is this possible and if yes, how to do that?

I know that if I create a Derived table on IDT doing a select on dummy table I could get that, but I want to avoid in maximum this.solution of a new Derived table.

Thanks,

Rodrigo.