AP Segregation

We want the AP invoicing and payment to work the following way and was wondering how can we do this.

We have 4 people in AP

Option 1

- Any one of 4 people can enter an invoice

- The person who entered an invoice can NOT validate it. This invoice can be validated by any one else (one of rest 3)

- Any one of 4 people can then pay this invoice

Option 2

- Any one of 4 people can enter an invoice

- The invoice is validated automatically by the concurrent program

- The person who entered that invoice can NOT pay it

Thanks

Naushad