Control the cost centres that buyers can code to when creating a purchase order

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Hi there,

We want to be able to control the cost centres that buyers can use when they populate the PO Charge Account when creating a purchase order.

So for example.

Person 1 (Buyer) when creating a purchase order can only use cost centre 111 when populating the PO charge account field.
Person 2 (Buyer) when creating a purchase order can only use cost centre 222 and 333 when populating the PO charge account field.
Person 3 (Buyer) when creating a purchase order can only use cost centre 444 and 555 when populating the PO charge account field.

FYI - We don't use requisitions within our instance of Oracle.