First of all I have a table named tblSignatures. The table has two fields... Initials (short text field), and Signature (attachment field).
On a report I want to populate or make a scanned image appear of the signature scan in tblSignatures. I have tried this as a control source for the image field but it doesn't work.:
=DLookUp("[Signature]","tblSignatures","[Initials] = '" & [Reports]![rptPurchaseOrder]![txtUserInitials] & "'")