You can't refer to tables and fields like that.
If it's a bound form, and Account is a field in the underlying recordsource,
just use
=[Account] & " Account"
If it's not a bound form, or if Account is not a field in the underlying
recordsource, try using DLookup:
=DLookup("[Account]", "[Transactions]) & " Account"
Of course, this will only work if there's a single row in the Transaction
table (otherwise you won't have any way of controlling the row from which
DLookup gets the value of Account ), but then your original code suffers
from the same problem.

Signature
Doug Steele, Microsoft Access MVP
http://I.Am/DougSteele
(no e-mails, please!)
>I am relatively new to Access but wonder if someone can point me in the
>right direction with a problem.
[quoted text clipped - 12 lines]
>
> Please help me....thanks in advance