Match Approval Level and Invoice Match Option

What is the difference between Match Approval Level and Invoice Match Option??

From Oracle User Guide

Select one of the following options for Match Approval Level:
• Two-Way: Purchase order and invoice quantities must match within tolerance
before the corresponding invoice can be paid.
• Three-Way: Purchase order, receipt, and invoice quantities must match within
tolerance before the corresponding invoice can be paid.
• Four-Way: Purchase order, receipt, accepted, and invoice quantities must match
within tolerance before the corresponding invoice can be paid.
If you enter an item, a value for this field is defaulted. See: Purchase Order
Defaulting Rules, page 4-10.

Select an Invoice Match Option:
• Purchase Order: Payables must match the invoice to the purchase order.
• Receipt: Payables must match the invoice to the receipt.
Choose Receipt if you want to update exchange rate information on the receipt
or if you want your accounting to use exchange rate information based on the
receipt date. (If you use Periodic Costing, you must match to the receipt to
ensure accurate cost accounting.)
The Invoice Match Option defaults from the Supplier Sites window. You can
change the Invoice Match Option on the shipment until you receive against the
shipment.
Note: The Invoice Match Option and the Match Approval Level are
independent options. You can perform whichever Invoice Match
Option you want regardless of the Match Approval Level.