I amended the expression to read
Expr2: DateAdd("m",DLookUp("Profile1Mths","FERC DATABASE2"),DLookUp("Tender Expiry","FERC DATABASE2"))
and this errored
I also tried
Expr2: DateAdd("m",DLookUp("Profile1Mths","FERC DATABASE2"),[FERC DATABASE2].Tender Expiry)
and this failed
any...