I have:
IIf([Lin]="XXB840",DLookUp("[unique]","[Data]","[unique] ='" & [parent] & "'" & " And [Lin]='[Mounts].[MountLin]'"),"")
Tables1
..Data
....Fields: all are Short Text
.....LIN
.....Unique
.....Parent
Table2
..Mounts
....Fields: Short Text
.....MountLin
Mounts.MountLin = Data.Lin but filtered down.
How do I look up the parent if Mounts.lin