first of all, u have to create tables and classes
for example, table 1 is non restricted access associated with class 1
so u can assign Extension 200 for example to class 1 and class 1 will follow the restricted data in table 1
and u can create table 2 and include the codes that u want to restrict and associate it to class 2
and same thing in class 3
what I usually do is:
Class 1 : no restriction
Class 2: 00 is restricted
Class 3: 0 is restricted
21-05-08 (Tables): assign table 1 to class 1 , table 2 to class 2 , table 3 to class 3
21-06-07 (Tables Data)keep table 1 empty, in table 2 enter 00 , and in table 3 enter 0
21-04-01 (EXTN rest.)assign the extensions to classes , for the extensions which has no restriction, use class 1 ...
cheers