When I added payments to InvoiceR, the error message indicated that OrderID could have more than one reference. To fix this problem it was necessary to make the control look like: =DSum("PaymentAmount","PaymentT", "OrderT.OrderID=" & [OrderT.OrderID]. This stopped the error message.
Reply from Richard Rost:
Very good, Ray. Yes, that is necessary if you have more than one reference to OrderID in your underlying query. You could also resolve the problem by removing one of the OrderID's from your query. You don't need two of them.
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