CJ, Thanks, you got me to follow the right track I just needed to experiment finding the right Syntax for DLookup. I found this works very well:
DLookup("Val([VcoDispChk]+[VcoInChk])","Reservations", "Reservations.].[CR#_] = 'CR01' And [VcoDispChk] = True and [VcoInChk] =False")
I did not...