REFERENCE(XS_TREE_BUFFER) TYPE WRF_TREE_NODE_STY
REFERENCE(LT_TREE_BUFFER) TYPE WRF_TREE_NODE_STY
REFERENCE(TREE_CHILD_NODE_WA) TYPE WRF_TREE_NODE_STY OPTIONAL
REFERENCE(TREE_BUFFER_WA) TYPE WRF_TREE_NODE_STY OPTIONAL