FMS query erroring out

Question

I created an fms query so my users could pick a default GL account and save to a UDF on the BP window.  This query is now working fine.  I then created a 2nd fms query and attached it to the "G/L Account" field on the AP invoice window so that when a vendor is selected and the user clicks on this field the GL account from the vendor's UDF will default. 
My problem is that the G/L Account field on the AP Invoice doesn't have a magnifying glass and shiftF2 does nothing.  If I go to tools/customize/User-Defined Values Setup it immediately shows the query I have linked to the field.  If I press ShiftF2 I get an "Internal error 8180".  If I go to Query Manager and run my query it errors out with a long msg saying "Microsoft SQL Native Client SQL Server incorrect syntax near '$[$4.0.0]'.2. Microsoft SQL Native Client SQL Server Statement activities OCLG (s) could not be prepared.
Below is my query which I copied from one of Gordon's prior posts.  It worked fine last week and we have made no changes.  My user defined field is DGL.  For some reason the forum changes the code below, but at the very end it should read dollar sign, open parenthesis, dollar sign, 4 dot 0 dot 0, closed parethesis.
Select T0.U_DGL from dbo.OCRD T0 Where T0.CardCode = $[$4.0.0]

Answer 1

Hi Robert,
Try this query:
SELECT T0.\[U_DGL\] FROM OCRD T0 WHERE T0.\[CardCode\] = $\[$4.CardCode\]
Regards,
Adrian