standard role 157

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hello and a happy new year to everybody,
 
i am using the standard role 157 to determinate the manager of user who
has a workitem in his/her inbox for deadline monitoring purposes.
 
for this role to work, i must assign 'chief positions' in the org
structure.
 
my question: what other standard role can i use to get the org unit 1
step above in the hierarchy ? (without having to use 'chief position')
 
thank you
best regards
 
ronen fox