We have 2 FlowFields on the Sales Header table that calculate a sum from all the Sales Line on the document. When specific fields on the Sales Line are validated, we are calling a CurrPage.Update to refresh the FlowFields. Doing this works on Sales Quotes and Sales Order. However, it does not work on Sales Invoice. After reviewing, I found that the SalesLines part on the Sales Invoice page does not have the UpdatePropagation property set. When I attempt to add the property to my page extension I get an error that the property cannot be customized. Any thoughts on why the property is not set for Sales Invoices? Anyone know how I could get this to work?
SalesLine part from Sales Invoice page
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Attempting to add it to my page extension

Thanks in advance