Ok, finally...
Put this code in the VJP sheet (Right click on the sheet tab, choose View code, and paste it there)
<font face=Courier New><SPAN style="color:#00007F">Private</SPAN> <SPAN style="color:#00007F">Sub</SPAN> Worksheet_Change(<SPAN style="color:#00007F">ByVal</SPAN> Target <SPAN style="color:#00007F">As</SPAN> Range)
<SPAN style="color:#00007F">If</SPAN> Target.Column = 2 <SPAN style="color:#00007F">Then</SPAN> <SPAN style="color:#007F00">'Is it an entry in column B</SPAN>
<SPAN style="color:#00007F">Dim</SPAN> Ans <SPAN style="color:#00007F">As</SPAN> <SPAN style="color:#00007F">Variant</SPAN>
<SPAN style="color:#00007F">Dim</SPAN> Rng <SPAN style="color:#00007F">As</SPAN> Range
<SPAN style="color:#007F00">'Did the user make an entry ?</SPAN>
<SPAN style="color:#00007F">If</SPAN> Len(Target.Value) = 0 <SPAN style="color:#00007F">Then</SPAN> <SPAN style="color:#00007F">Exit</SPAN> <SPAN style="color:#00007F">Sub</SPAN>
<SPAN style="color:#00007F">With</SPAN> Sheets("InputFromKing") <SPAN style="color:#007F00">'Define the lookup range</SPAN>
<SPAN style="color:#00007F">Set</SPAN> Rng = .Range("A2", .Range("A65536").End(xlUp))
<SPAN style="color:#00007F">End</SPAN> <SPAN style="color:#00007F">With</SPAN>
<SPAN style="color:#007F00">'Search for the changed cell in VJP</SPAN>
Ans = Application.Match(Target.Text, Rng, 0)
<SPAN style="color:#007F00">'Did we find it ?</SPAN>
<SPAN style="color:#00007F">If</SPAN> IsNumeric(Ans) <SPAN style="color:#00007F">Then</SPAN>
Application.EnableEvents = <SPAN style="color:#00007F">False</SPAN> <SPAN style="color:#007F00">'Turn events off</SPAN>
Target.Offset(, 1).Value = Rng(Ans).Offset(, 1).Value <SPAN style="color:#007F00">'Put the associated Naam</SPAN>
Application.EnableEvents = <SPAN style="color:#00007F">True</SPAN> <SPAN style="color:#007F00">'Turn events on</SPAN>
<SPAN style="color:#00007F">Else</SPAN>
Ans = "" <SPAN style="color:#007F00">'To convert the variable to a string</SPAN>
<SPAN style="color:#007F00">'Ok, it's not on the list, so, let's warn the user</SPAN>
Ans = InputBox("Vul hier de omschrijving in", "Vul hier de omschrijving in", "")
<SPAN style="color:#007F00">'Did the user enter something there ?</SPAN>
<SPAN style="color:#00007F">If</SPAN> Len(Ans) = 0 <SPAN style="color:#00007F">Then</SPAN>
<SPAN style="color:#007F00">'Cancelled or didn't enter anything</SPAN>
<SPAN style="color:#007F00">'so, delete the current entry and exit the code</SPAN>
Application.EnableEvents = <SPAN style="color:#00007F">False</SPAN>
<SPAN style="color:#00007F">On</SPAN> <SPAN style="color:#00007F">Error</SPAN> <SPAN style="color:#00007F">Resume</SPAN> <SPAN style="color:#00007F">Next</SPAN>
Application.Undo
Application.EnableEvents = <SPAN style="color:#00007F">True</SPAN>
<SPAN style="color:#00007F">Exit</SPAN> <SPAN style="color:#00007F">Sub</SPAN>
End <SPAN style="color:#00007F">If</SPAN>
<SPAN style="color:#007F00">'Put the Naam</SPAN>
Application.EnableEvents = <SPAN style="color:#00007F">False</SPAN> <SPAN style="color:#007F00">'Turn events off</SPAN>
Target.Offset(, 1).Value = Ans
Application.EnableEvents = <SPAN style="color:#00007F">True</SPAN> <SPAN style="color:#007F00">'Turn events on</SPAN>
<SPAN style="color:#007F00">'Store the Rekening and the Naam in InputFromKing</SPAN>
<SPAN style="color:#00007F">With</SPAN> Sheets("InputFromKing").Range("A65536").<SPAN style="color:#00007F">End</SPAN>(xlUp)
.Value = "'" & Target.Value <SPAN style="color:#007F00">'Make sure its entered as a text</SPAN>
.Offset(, 1).Value = Ans
<SPAN style="color:#00007F">End</SPAN> <SPAN style="color:#00007F">With</SPAN>
<SPAN style="color:#00007F">End</SPAN> <SPAN style="color:#00007F">If</SPAN>
<SPAN style="color:#00007F">End</SPAN> <SPAN style="color:#00007F">If</SPAN>
End <SPAN style="color:#00007F">Sub</SPAN>
</FONT>