S&OP gets introduced to bridge planning functions that were never built to align. Instead of closing that gap, it inherits it. Supply reacts to demand planning, but rarely the other way round, even though it arguably should.

At one global retailer, commercial promotion planning generated demand peaks the warehouse simply couldn't absorb, deliveries ran late and external storage became an emergency cost. The demand had been created without ever checking whether operations could carry it.

• Replanning cycles: teams reconcile competing versions of the plan instead of acting on one.
• Working capital: inventory buffers compensate for planning uncertainty that better architecture would have prevented.
• Margin and service: commercial decisions that bypass the planning cycle reach supply chain too late to adjust for.

S&OP meetings end up explaining these differences instead of simulating the optimal flow of goods. That's alignment, not steering.

Integrated planning has to start at the top, as a governance question, not a local one.

1. Put commercial, operational and financial planning on one shared 6-to-18-month horizon, not three timelines reconciled after the fact.
2. Bring commercial and portfolio decisions into the planning cycle early, before they become operational surprises.
3. Give someone genuine end-to-end ownership of the outcome, so the architecture has an accountable owner, not just a meeting.

Start by tracing one recent S&OP meeting back to its inputs: were commercial, supply and financial plans built on the same assumptions, or reconciled afterwards? That answer usually reveals where the architecture breaks.

From there, bring capacity and network constraints into the conversation while plans are still adjustable, not after commitments are made, and use the meeting itself as a decision moment rather than a reporting one. Done well, this doesn't add process, it removes the replanning your team currently treats as normal.