Posted Invoice Update - Vantage 8.03.409a

Yahoo Archive
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We want to be able to change the Due Date on the AR Posted Invoice Date so I have added the field to the form and set extended properties as below but the field is not being enabled. I have tried the code after custom code and after form load but no luck... any suggestions? Thanks.

Dim edvDueDate As EpiDataView = CType(oTrans.EpiDataViews("InvcHead"),EpiDataview)
edvDueDate.dataView.Table.Columns("DueDate").ExtendedProperties("ReadOnly") = False
edvDueDate.dataView.Table.Columns("DueDate").ExtendedProperties("Enabled") = True