Both of the 'Inv #' calculated columns are the same in each view:
{Trx Type} & {Doc #}

You then could choose to do a filter on the Matching view to select only invoices as the document type and cash as the matching type, or whatever else is desired. The video workspace doesn't have this.

These are required in order to get the GetLinkedValue to work as desired, as you have to sort the Matching file by invoice number and then by date descending in order to get the most recent payment date per invoice.

PS: I am that demo guy...