enter X with data validation

Hello to all.
In the attached workbook in column D3 onwards there is a value (minutes)
I think it is accurate with a data validation combined with a macro.
It should work like this:

now in D3 there is 25.00 (minutes) in the drop-down menu I choose "6FDLDL88" letter X must be inserted in K3
now in D5 there is 204.00 (minutes) in the drop-down menu I choose "11HFLLFLF11" the letter X must be inserted in P5
now in D7 there is 51.00 (minutes) in the drop-down menu I choose "5EASDE55" the letter must be inserted in J7

and so on up to line 60000
I hope I explained myself.
xam

Attached Files

• CONVALIDA DATI.xlsx‎ (13.0 KB) Download