Hi, I have investigated this error on google and I believe I know WHY the error is occuring (lack of single quotes) however I don't have the knowledge to work out where to put them.... 
I'm really not great at programming here is my code:
[Full_Product_Code] is a string value which I think is the issue. Besides anything else this exact code with a numeric Primary key on another query works perfectly (though extrememly slow).
Cheers
I'm really not great at programming here is my code:
Code:
ProductDec: Concatenate("SELECT Ing_Dec_Fin FROM QProductIngredientLine WHERE [Full_Product_Code] = " & [Full_Product_Code] & " ORDER BY [QUID%] DESC")
[Full_Product_Code] is a string value which I think is the issue. Besides anything else this exact code with a numeric Primary key on another query works perfectly (though extrememly slow).
Cheers