What is best practice for setting Up service POs with multiple billing installments?

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What is best practice for setting Up service POs with multiple billing installments so the correct amount is received each period? Scenario: A PO for $300 is entered for professional services and, per the SOW, the external supplier will be billing monthly for 3 months. In the first month the requester receives the entire PO amount of $300, but only $100 of it is invoiced that month. Therefore Oracle Accrue at Receipt has accrued $200 for that period. Is there a better way to setup the PO to restrict requesters from receiving the entire amount?

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