User`s guide

Orders TableOrders TableCustomer Table
Order AmountOrder IDCustomer ID
12763.953263
8233.501464
65
66
10320.8725
23.5.10.5 Not Enforced
When you select this option, the link you've created is used only if it's explicitly required by the Select
statement. Your users can create reports based on the selected tables without restriction (that is, without
enforcement based on other tables). This is the default option.
23.5.10.6 Enforced From
When you select this option, if the to table for the link is used, the link is enforced. For example, if you
create a link from TableA to TableB using Enforce From and select only a field from TableB, the Select
statement will still include the join to TableA because it is enforced. Conversely, selecting only from
TableA with the same join condition will not cause the join to TableB to be enforced.
Note:
For an explanation of from and to tables, see Link from and link to.
2012-03-14536
Understanding Databases