Odd behavior with 'Execute SQL' action and storing data in variable.

I'm fighting a strange problem and hope someone here can assist.  

I have a workflow setup that executes a very basic query against a SQL View:

SELECT [OrderNumber] FROM [Database] WHERE [BarcodeValue] = '{ItemProperty:Barcode_x0020_Value}';    

And I then want to store that in a workflow variable.  

If I use the 'Run Now' section the connection tests fine, query with the item property completes successfully and if I plug in a barcode value the data returned is correct.

However, if I run the workflow and try to store the data in a variable I receive: 

Error performing database operation. Format of the initialization string does not conform to specification starting at index 71. 

I thought maybe it was a mismatch between the returned data and the variable, but I've tried multiple types of variables and always receive the same error. 

I've tried this with multiple data fields as well and the same results follow - even basic fields that are clearly single lines of text.  

Any suggestions on how to track this down?