GL Control on Employee Record

What goes on the GL codes card for the Employee record? It doesn’t appear to be described in the help for Employee Maintenance. Also not required in order to save the record, so how are they used?
Thank you!

As I understand it (and I could well be wrong here, please someone else correct me if I am!), the hierarchy for Employee Labor expense is:

  1. GL Control Code on the Employee record; if empty then
  2. GL Control Code on the Resource Group defined at the Employee level; if empty the
  3. GL Control Code on the Department for the Operation being recorded against.

But I can’t find any documentation to either support or invalidate that…

EDIT: #3 should be
3. GL Control Code on the Department of the Resource/Resource Group defined on the Operation being recorded against

Thank you, Ernie!