How to add days in Stock Transfer Doc based on Doc Date?

Hi All

I need to add 180 days in an UDF based on Doc Date of Stock transfer. I have created a query -----

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SELECT DATEADD(dd,180,$[T0.DocDate]) FROM OWTR T0 WHERE T0.[Series] = '60' and  T0.[U_StType]  = 'Issue for JW'

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but it is giving me an error, and not working. Can any one please help.

Thanks

Akash Jawanjal