have a look on the join datatable activity (inner join) and removel later the unneeded join columns with a filter datatable (column removal setting).
also have a look here:
as dt2 currently has not a common join datacolumn we can manipulate by e.g. adding an addtional datacolumn along with a default value set to the invoice number.
have alook here as well
so the flow could look like this
- add join col to dt2
- join datatable dt1 to dt2 inner join
- remove dt2 join datacolumn from join result
Another technique is to do the merge via row Itemarray construction and you can refer here: