3586410 - How to prevent users from submitting the Purchase Requisition/Purchase Order more than the contract Maximum amount?

How can Buyers be prevented from submitting requisitions if contract hard limits are exceeded?
Why is system allowing the user to submit Purchase Requisition (PR) more than the Contract Maximum Limit?

Application.Contract.MasterAgreement.EnforceHardLimitsDuringSubmission, IsHardMaximumLimit, IsHardLimit, Contract Max amount, Maximum Amount , KBA , BNS-ARI-PUR-ACC-MT , Contract Milestones , BNS-ARI-PUR-PO , Purchase Orders , BNS-ARI-INV-ACC , Contract-Based Invoices , BNS-ARI-INV-IR , Invoice Reconciliation , BNS-ARI-INV-PO , PO Based Invoicing , Problem