Sort containing column labels in protected cells [closed]

edit

Hello,

I have a sheet like this :

===============================
| LABEL 1 | LABEL 2 | LABEL 3 |        <-- 3 protected cells
===============================
| data 1  | data 2  | data 3  |
|---------+---------+---------|
| data 4  | data 5  | data 6  |
|---------+---------+---------|
| data 7  | data 8  | data 9  |
|---------+---------+---------|

I need to protect first row containing column labels.

But when I try to sort data using a macro or using Sort menu, selecting LABEL 1 as Sort Key 1 and specifying in Options that range contains colum labels, operation fails due to cell protection even if protected cells (labels) do not have to be modified.

Is it a bug ?

Is there a workaround ?

Thanks in advance

Ed