ENABLE Reference Manual
 ENABLE ATTRIBUTES
 TREE Attribute
 The following TREE attribute identifies the level number
 of each box and the join field that links each box to a higher
 level box.
 SET APPL TREE (01 odetail
 02 order LINK odetail TO OPTIONAL order
 VIA ordernum
 03 seller
 LINK salesman TO OPTIONAL empnum
 02 parts LINK odetail TO OPTIONAL parts
 VIA partnum
 03 fromsup
 LINK parts TO OPTIONAL fromsup
 VIA partnum
 04 supplier
 LINK fromsup
 TO OPTIONAL supplier
 VIA suppnum)
 Alternatively, you could use the following TREE attribute
 to build a tree structure for the same boxes:
 SET APPL TREE (01 order
 02 seller LINK salesman TO OPTIONAL empnum
 02 odetail
 LINK order TO OPTIONAL odetail
 VIA ordernum
 04 parts
 LINK odetail TO OPTIONAL parts
 VIA partnum
 06 fromsup
 LINK parts TO OPTIONAL fromsup
 VIA partnum
 08 supplier
 LINK fromsup
 TO OPTIONAL supplier
 VIA suppnum)
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