there are VO1,VO2,VO3.Each one has id and name fields.
i try to build a 3-level tree: VO1 is parent to VO2 which is parent to VO3
it's supposed to be a tree containing all elements of VO1 on the upper level, each leaf of which should contain all elements of VO2 etc
in order to ensure cartesian join i created a column lvl1 with value 1, and lvl2 with value 2.
then i created 2 view links between each pair: VO1 and VO2 are linked by lvl1, VO2 and VO3 are linked by lvl2.
any 2 level trees are showing ok in all combinations (between VO1/VO2, VO2/VO3)
but when i define 3 levels in tree level binding , application fails with error: (tree is kept in a region)