Review Transfer Pricing Policy of the organisation.Check approvals for it.
Now check the accounting Entries.There should be consistency.Inquire about reversals.Check for due payments.
Ask details and reasons for unsettled amounts.
Check the rates and quantities of the transfer.Compare it with Market Price. If there is big difference, point it out and ask reasons for such a policy.
Check Reconciliation between the two divisions.Any difference should be accounted and should reflect in Trial Balance.