Combo-box and protecting data

[Martine]

I have a table of societies and a table of the members from the societies.
I have a form in which the user can create, see or modify one member of a society.
In the head of my form i put some informations over the society (name, adress..)
To make his research easier in all cases (create, modify or just consulting) i made a combo box for the name of the society (the other informations of the society are proteted).

I works well, but my problem is that I do not want the user to be able to change the society for an existing member.
How can I avoid this ?

 

[Richie]

Make the form read only?

 

[Martine]

thank you for the answer, it works well.
The only thing is that i loose the possibility to search another society with the combo box when it is not a creation of a new member but it is better than the risk to have a society changed.