How to record deletion of text from a form

Hello,

I perform recording of simple action (assessment mode).

I have a filled form and need to record the following action:

1> go to the Address field (which contains the text '247 RUE DE BERCY 75012')

2> change 247 with 248 in this field

To do so, I record the following:

place the cursor with the mouse just after 7 (of 247) and press the DEL ...
The result of the recording is not good as I can't find the deletion in Demo or Assessment mode...

Could you please help?

Thank you very much in advance

Soizic