How do the SRM-EBP Approval and Spend Limits work

[Martinek, Jerry]

Hi,
 
I'm trying to get an understanding on how the approvers spending/approval
limits processing works withing the EBP 4.0 approval process.
 
I know that you can specify the approval limit amount at the Organizational;
Position and User levels. If that is the case, what would you specify in an
approver  'ROLE' that is assigned to a Position held by an approver? How
does this work?
 
How does this resolve in the EBP system? Can someone provide an explanation
on how this works; link to some understandable documentation or the code
that implements this functionality?
 
Also, when you set the Organization or Position 'Approved for value limit'
Attribute as well as the 'Approval Limit' in the Extended Attributes PO
Value limits, what does this mean?
 
 
Regards,
Jerry Martinek