Note 1760770 - Unable to change method visibility

Hello,

I am currently implementing note Note 1760770

It says :

Change method attributes:

1. Call transaction SE80. Select "Class / Interface" and enter CL_SEPA_MANDATES_ALV_GRID.

2. Expand the methods in the menu tree.

3. Click the method GET_SELECTED_MANDATES with the secondary mouse button.

4. In the context menu, choose "Change -> Definition".

5. Switch to the "Attributes" (or "Properties") tab page.

6. Change the visibility from "Private" to "Public".

7. Save and activate your changes.

But when I do so the visibilityis not available for change :

How can I change it ?

I am not sure if disabling the assistant and doing the change directly in the private/public section is the right thing to do ?

Cheers, Manuel