Requisition Approvals

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Hi All,

Our Client uses the Requisition approvals based on the cost centre in the PO charge account.
For example, User A has the approvals authority for cost centre 100000. So, when User A raises a requisition for the cost centre 100000, the requisition is going for approval to User A, which should not be the case. User should not be able to self approve his own requisitions.
What changes can be done in the system, so that for the above scenario, the requisition goes to next level approval and not come back to the requestor of the requisition, please?

Thankyou in advance.