Need to Make Install Base Page Read only Calling from Custom Form

hi

We are using below seeded Form Function to call IB page but we need to display IB page as Read only. We tried with Sub-function approach but it didnt work. Also the user is having the readonly role but when calling from forms user are able to update Install base Page details.

begin

   IBstring := 'InstanceId=' ||

                                                            name_in('BECOKC_INSTRUMENTS1.INSTANCE_NUMBER')   

FND_FUNCTION.EXECUTE( FUNCTION_NAME =>'CSI_OA_INST_DETAILS',

                           OTHER_PARAMS  => IBstring,

                           BROWSER_TARGET => 'OAIB');

End;