[SQL] Repeat Date in Teradata Studio vs. SQL Data Assistant

I am new at my job and we use Teradata. I am using Teradata Studio, and one of our longer Procedures starts with this statement:

SELECT


'?Start_Period' as "Start Period",
'?End_Period' as "End Period"
;


It will not run for me in Studio, but my manager and colleagues who use SQL Assistant with Teradata can run it. Is there something I can use in place of the ? in studio that will give me the same result?

Thanks!

I have tried using ampersand with the same error code:

Data definition not valid unless solitary.
​

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