In the http://root.cern.ch/root/html/TTree.html#TTree:GetEntry there is:
WARNING!!
If your Tree has been created in split mode with a parent branch “parent”,
and I believe it should be:
WARNING!!
If your Tree has been created in split mode with a parent branch “parent.” (note the trailing dot),
Also, you could add there:
Without the trailing dot in the branch creation you have no choice but to call SetBranchStatus explicitly for each of the sub branches.
(Note: both proposed changes are already present in the http://root.cern.ch/root/html/TTree.html#TTree:SetBranchStatus description.)
Moreover, the “trailing dot in branch names” is better explained in the http://root.cern.ch/root/html/TTree.html#TTree:BranchOld and http://root.cern.ch/root/html/TTree.html#TTree:Bronch descriptions, but not in any current “TTree::Branch” description.