I am unable to get a script to fire to modify the AP_InvoiceHeader when adding an invoice on the fly in Manual Check Entry. 

Goal is to copy AP_Vendor.Comment to AP_ManualCheckHeader.Comment to AP_InvoiceHeader.Comment. 

Have a similar feature in AP Invoice Data Entry triggered by Table Set Default Values. 

Unfortunately, Set Defaults doesn't trigger when adding an invoice on the fly in Manual Check Entry (probably is bypassed by the 'Is this a new invoice?' message). 

Does anybody have an idea how to trigger a script here?