Configuration tables using copy / paste

Something I have not been able to do is pasting from a spreadsheet without (!) getting the 'untitled' entry on the bottom.

I have to duplicate many similar entries in different configuration tables in the same assembly. To copy a configuration table into a spreadsheet is easy.

In excel I copy the values, in my case only two columns; In the configuration table, I click the first entry in the Name column and paste in the table, which has the same number of columns (!).

All is copied as intended, but it always creates an extra 'untitled' line on the bottom, which I have to remove. How to prevent this? Thanks, Gerard