Add Alternate Invoice ID Merged

Alternate invoice ID like we had in DF Legacy would be helpful when using repetitives.  Repetitives automatically general an invoice ID but there is no place to enter an alternate invoice ID.  Using the alternate ID allows us to ensure we are not entering duplicate invoices or making double payments.  

I know there is a spot that says "additional stub information" or something like that, but this is virtually useless since it appears nowhere on the invoice entry and cannot be used to search an invoice or relate it to something else.