If the FirstName and LastName field aren t actually on the ContactLetterR, where is the concatenated field  FullName  obtaining it s data from? Is the Report s Record Source like a Query s Table or the Query fields you bring into the  Field:  row to make calculated fields off of (even if you don t bring them into the Report directly)?

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Reply from Alex Hedley:

ContactLetterR has a RecordSource of ContactForLetterQ
ContactForLetterQ is a Query using two Tables: CustomerT and ContactT.
CustomerT has both FirstName and LastName

There is a Textbox on the Report called: FullName that has a Control Source of :=[FirstName] & " " & [LastName]