Use this dialog when you select an item in the Item field that has a parameter created against it, and you want to match the selected item against a dynamic value entered as a parameter.
For example, you have a parameter called 'Increase amount' that is set to 1000. The 'Increase amount' parameter value entered is used to calculate a stock increase amount. You might also want to restrict the worksheet to items where the quantity is greater than the value of the 'Increase amount' parameter (that is, 1000 in this example).
For more information, see:
Use this list to select which parameter value you want to match against the selected item.