FMS to show AP Invoice UDF in rows on Outgoing payment window

Experts,

I get an error on a FMS on the Outgoing Payment Invoice rows. This should populate with a data on the AP Invoice header UDF. The error refers to Syntax near "$"

SELECT T0.U_XXX_L_02

FROM OPCH T0

WHERE T0.DocNum = $\[$20.1.0]

Any help would be greatly appreciated.

Marli