Contract variation fees that escalate after month three turn every integration discovery into a budget fight instead of a design fix. Procurement teams learn to lock scope early and ignore what surfaces once data actually moves.
The pattern repeats across energy, retail and government. Buyers accept the vendor's integration estimate because changing it later costs more than the original platform licence. Real mapping gaps only appear after cutover when transaction volumes expose them.
Consultants who ran the RFP often disappear before those gaps surface. Their success metric was signed contract, not working handoffs. The buyer is left negotiating paid change orders with the same vendor who shaped the original scope.
Fixed integration budgets create perverse incentives inside the buyer organisation too. Project sponsors stop surfacing issues that would trigger extra spend. Teams quietly build workarounds instead of fixing the connection.
Australian energy retailers have seen this cycle on CRM and billing replacements for years. Each new platform arrives with the same optimistic interface assumptions and the same post-go-live variation queue that never gets cleared.
The fix starts in the contract itself. Buyers need staged integration milestones with explicit allowance for scope adjustment without penalty, plus independent review of the vendor's integration claims before signature.
Without that structure, every platform purchase simply repeats the last one: good demo, frozen architecture, ongoing change-order revenue for the vendor.