Notes

1.if(ComboBox.selection() == ABC::A)

2. Sales Invoice report in ax 2012 R3

Getting the customer address from salesorder i,e salestable ... we should consider
LogisticsPostalAddress table

select salesTable
        join logisticsPostalAddress where salesTable.SalesId == "05SSSSO171800115"
        && logisticsPostalAddress.RecId == salesTable.DeliveryPostalAddress;     
 
    info(strFmt("%1",logisticsPostalAddress.Address));

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tables and classes involved in Sales Invoice report

url

https://atinkerersnotebook.com/2012/10/05/creating-automatic-email-confirmations-from-dynamics-ax/