Function Module for Determining Owner Position of a Cost Ctr

Question:
I need to determine who the 'owner' of a cost centre is so that we can send an email to this person(s).
I have found SAP FM RH_COST_CENTER_RESPONSIBLE which gives me the "postion" that owns the cost centre. Then I look up the person that is in that position, and subsequently their email address.
The problem is, this FM does not always return the owner position of the cost centre and doesn't indicate why.
Does anyone:
(a) either know of another FM that might give me this info
(b) maybe know some things I could check to determine if our HR org data is set up correctly ? So far, I haven't noticed differences between a cost centre lookup that works, and one that doesn't...
Thanks for any help !
Patti
Answer:
We have figured this one out !
If a cost center is 'hardcoded' to the person, then this workflow FM does not pick it up.
Thanks

More Articles:

GRID DISPLAY - CHANGE CONTENTS IN TOP_OF_PAGE?
Problems with new transaction-Copy of a standard transaction?
copy function group?
Retrieving the structure of a Internal table?
Creating a Table Control in a sub-screen - lead to problems?
Changing SAP standard structures.?