I use the following DLooUp string on a form to show the company name from the Customers table after I enter an account number on my "Order Form". For some reason the Company Name text box shows as an "Error" until I add the account number. Shouldn't that just be blank until I enter an account number? The Account Number is a "Number" value.
=NZ(DLookUp("CompanyName","tbl_Customers","AccountNumber =" & [DBAccountNumber]),Null)
=NZ(DLookUp("CompanyName","tbl_Customers","AccountNumber =" & [DBAccountNumber]),Null)