I have a form that needs to check that the data being enterred is valid from another table or is null. But I also need to note if the inservice checkbox is checked. Here is the the dlookup so far:<BR><BR>=DLookUp("SerialNumber","Table","Seria lNumber = Forms!Form!SerialNumber") Or Is Null<BR><BR>How do I check the same table to see if the inservice checkbox is checked? (i.e. InService is false).<BR>