Date parameters with Sage

I am attempting to build a report for SSRS using Visual Studio. 

I have a query that is returning results, and the report is functioning perfectly.  However, the end user decided they wanted a date range selector on this report.  I have done this hundreds of times before with standard SQL databases/reports, but never before when accessing a Sage database.

Here is my issue.  When I put the date parameters into the query, it throws an error message.  Here is the line in the query that is causing me the issue:

AND SO_SalesOrderDetail.PromiseDate between {d @beginDate} and {d @endDate}

And here is the error message it gives:

Error[37000][ProvideX][ODBC Driver]Expected lexical element not found: <identifier>.

This query functions perfectly if I hard code a static date into it, but the user wants to be able to select a date range of their own.  Any ideas on how to fix this issue?

Mitchell Colwell