You can also fill starting at the level of an individual ProDataSet member table by applying the FILL method to that table's buffer, as in this example: 

httOrder:FILL().

Or, without using a buffer handle:

BUFFER ttOrder:FILL().

This fills the ProDataSet starting with the buffer's temp-table. If the temp-table is the child of a Data-Relation, then only rows matching the rows already in the parent will be filled. This means that there must be at least one parent row if the FILL is to add any rows to the ProDataSet. If there are active relations to the buffer's child tables, they are filled as well. When you execute the FILL method on a buffer handle rather than on the ProDataSet handle itself, you can deactivate Data-Relations to limit the depth to which the ProDataSet is initially filled.

Note that a FILL on a buffer traverses each branch of the hierarchy below that buffer until it encounters an inactive relation or a buffer marked as NO-FILL, which you will learn about shortly. In either of these cases, the FILL stops on that branch of the hierarchy.