Approval groups for PO´s in Purchasing when approving transactions

Can I set the Approval Groups only by Item Range? I know Document Total and Account Range are mandatory, but the workflow has to find the approver according to the Item Range and of course the Document Total. 

Ex:

document total: 999,999,999.00

account range: all CCID

item range: METCC% to METCC%

When a PO is sent for approval it doesn´t take in count item range, and it goes to the next person available in the hierarchy taking in count document total and account range. 

Modules implemented for Procurement Cycle: GL, AP, PO, INV. Thanks a lot !!!