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Dsum and iif on report

pdvsa asked
Last Modified: 2020-03-23

I am trying to combine the below in an unbound field on a report.
Maybe its better to do it by VBA?  
Not sure which way is easier.

thank you...

In English:
If tblLetterOfCredit.PaidInFullYN = True then "Paid In Full", if not then Dsum but only if tblPayments.PaymentDate is not null (meaning there is a date entered)

If tblLetterOfCredit.PaidInFullYN = True then "Paid in Full"

If is not null [PaymentDate] then Dsum [Amount].  How to add Is Not Nulll to below?
=iif(DLookUp("[PaymentDate]","tblPayments","[LCID] = " & [LetterOfCreditID]
dsum("[Amount]","tblPayments","[LCID] = " & [LetterOfCreditID]
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