Multiple Parameters Doesn't Work On Multiple Fields

I created the below query to come up with a new form. When I enter a single parameter, it works fine. When I modify the code and enter multiple patameters, it also works fine if I do not enter any information for the parameters. But once I enter one of the parameters information, then it does not come up with anything. I double checked and made sure it was typed in correctly. Is there a trick when entering multiple parameters on a query?


SELECT [JE 06 Log].[Operational Region Name], [JE 06 Log].[Period Name], [JE 06 Log].[Source System], [JE 06 Log].[Source Name], [JE 06 Log].[Category Name], [JE 06 Log].[Associated Category Name], [JE 06 Log].[JE Name], [JE 06 Log].[JE Base #], [JE 06 Log].Area, [JE 06 Log].[Line Description], [JE 06 Log].[Natural Account], [JE 06 Log].Description, [JE 06 Log].[JE Entry Date], [JE 06 Log].[Debit Amount], [JE 06 Log].[Credit Amount], [JE 06 Log].Amount
FROM [JE 06 Log]
WHERE ((([JE 06 Log].[Period Name])=[Enter Period]) AND (([JE 06 Log].[Source Name])=[Enter Path]) AND (([JE 06 Log].[JE Base #])=[Enter Base Number]) AND (([JE 06 Log].[Natural Account])=[Enter Natural Accnt])) OR ((([Enter Period]) Is Null) AND (([Enter Path]) Is Null) AND (([Enter Base Number]) Is Null) AND (([Enter Natural Accnt]) Is Null));