How do I link Authorizations For Expenditure (AFE) approvals with my procurement activities?

High value project expenditures require executive management authorization. When this approval is granted, budget is allocated to an investment measure (project or internal order). Purchase Orders are then assigned to these investment measures as commitments. Actual costs are accumulated on these investment measure on receipt of the ordered goods or services. If supplier invoices vary from the purchase order values, these variances can be accepted, and also accrued on the investment measure. On project completion, the accumulated costs on the investment measures are settled to a corresponding Fixed Assets.