Ok I figured out a work around!!!
I noticed that every time I pressed the button the error window came up only if the field was already with the same text I was trying to assign. If I edited the field manually and changed records back and forth it worked perfect, but if I pressed the button again then the error window poped up again.
So I figured, lets check first if the string Im trying to assign is the same one as in the one contained in the field? and if it is, then do something else, or nothing.
I proved it this way:
Private Sub button2_Click()
If Me.myfield = "whatever" Then
Me.myfield = "other"
Else
Me.myfield = "whatever"
End If
Me.Refresh
End Sub
This way I can click as many times I want my little button and it just toggles the word "whatever" with "other" without any annoying popups

Now I will just adjust this to the data I was intending to assign to the original field and I will be a happy person again
So, problem solved, thank you very much for your help, there´s no kiss this time

but Im very grateful for your time
