A finance team rekeying web orders into an ERP system, a warehouse chasing stock discrepancies, and customer service checking three screens for one delivery update are not separate problems. They are signs that the same operational data is being managed in disconnected places. The question of which systems should integrate first is therefore not about choosing the most fashionable platform. It is about removing the points of friction that cost the business time, sales and confidence.

For most growing organisations, integration priorities should be set by commercial impact and operational risk. Start with the processes where a delay, error or missing update directly affects a customer, a supplier, cash flow or the ability to fulfil an order. A well-chosen first integration creates a reliable foundation for the next one. A poorly chosen project can automate a marginal task while the most expensive manual work continues elsewhere.

Which systems should integrate first?

The best starting point is usually the connection between your system of record and the channel where transactions begin or must be actioned. In many businesses, that means ERP and e-commerce. In others, it is ERP and CRM, or ERP and a marketplace. The right order depends on how your business operates, but the principle stays the same: integrate the data flow that governs the most critical daily decisions.

Your ERP is often central because it holds product data, stock positions, pricing, customer accounts, purchase orders and financial records. If orders are created in Shopify, a marketplace or another sales channel but then entered manually into the ERP, that hand-off is a strong candidate for first priority. Automating it can reduce rekeying, prevent incorrect orders and give operations a current view of demand.

The value is greater when the flow works both ways. Orders should move into the ERP quickly, while accurate stock availability, pricing and fulfilment status should return to the sales channel. This helps prevent overselling, reduces cancelled orders and gives customers clearer information before they contact your team.

There are exceptions. A business with a stable order flow but poor lead management may gain more from connecting its CRM to ERP first. If sales teams cannot see credit status, contract pricing, order history or account details, they may make commitments that operations cannot fulfil profitably. A CRM-ERP integration can give commercial teams a more accurate picture of the customer while reducing duplicate account maintenance.

Start where manual effort meets customer impact

A practical way to prioritise is to map the journey from enquiry to cash collection. Identify each point where someone exports a spreadsheet, copies data between systems, sends an internal email for an update or checks a separate portal. Then ask four questions:

• How often does this process happen?
• What is the cost when data is late or wrong?
• Does it affect revenue, fulfilment, customer experience or financial control?
• Is the source data reliable enough to automate?

High-volume, high-consequence processes should lead the queue. An integration that removes ten minutes of manual work from each of 200 daily orders is more valuable than one that improves a monthly reporting task, even if the reporting project initially appears easier.

It is also worth considering timing. A manual process may work during normal trading but fail during seasonal peaks, promotions or a rapid expansion into new channels. Prioritising the integration that protects the business at its busiest can prevent a growth opportunity becoming an operational problem.

The most common first integration patterns

ERP and e-commerce

For retailers, wholesalers and distributors selling online, ERP-to-e-commerce integration is frequently the first project with a clear return. The typical scope includes orders, stock, products, prices, customers and fulfilment updates. It creates a more dependable order-to-dispatch process and reduces the gap between what customers see online and what the business can actually supply.

The trade-off is that product and pricing rules must be agreed before automation begins. If different teams maintain conflicting product descriptions, stock definitions or price lists, an integration will expose those inconsistencies rather than solve them. Establish which platform owns each data field and what should happen when information conflicts.

ERP and courier or warehouse systems

If the warehouse is the busiest source of manual intervention, connect ERP to courier platforms or warehouse systems early. Sending shipment details automatically, receiving tracking updates and producing labels from the correct order data can reduce dispatch delays and improve customer communication.

This is especially relevant where delivery promises influence repeat business. A customer may tolerate a short delay; they are less likely to tolerate being told an order has shipped when it has not, or receiving no tracking information at all. Accurate dispatch events also help finance and customer service work from the same status.

ERP and marketplaces

Marketplace sales can grow quickly, but each new channel can introduce its own product identifiers, inventory rules, fees and order formats. Integrating marketplaces with the ERP early is often sensible when marketplace orders are material in volume or strategically important.

The priority should be controlled inventory and order processing, not simply importing every available data point. Begin with the information needed to avoid overselling and fulfil orders correctly. Once that is stable, expand into product content, pricing logic, returns and financial reconciliation where the business case supports it.

CRM and ERP

A CRM-ERP connection should move up the list when sales, account management and finance are working from different customer records. It can support better quotation accuracy, credit-aware selling, account visibility and handover from sales to operations.

However, not every CRM field belongs in the ERP, and not every ERP record is useful in the CRM. A focused design is more effective than attempting to synchronise every contact, note and status. Define the decisions each team needs to make, then automate the information that supports those decisions.

Do not integrate around a broken process

Integration is not a substitute for process ownership. Before selecting systems, identify who owns the process, which system is the source of truth and what a successful outcome looks like. Without these decisions, teams can end up debating whether a stock figure, customer address or order status is correct after the integration is live.

Data quality deserves the same attention. Duplicate customer accounts, inconsistent SKUs and incomplete addresses can produce errors at speed once systems begin exchanging data. A short data-cleansing exercise and clear validation rules can save significant rework later.

You should also be realistic about the first release. A phased implementation is often safer than a large programme that tries to connect every process at once. For example, an initial ERP and e-commerce integration may cover orders and stock updates first. Product enrichment, complex promotions, returns and exception workflows can follow once the core flow is proven. This approach limits disruption while allowing teams to see measurable results sooner.

Measure the priority in business terms

A good integration plan has operational measures attached to it. Track order-processing time, manual touches per order, stock-related cancellations, dispatch accuracy, time to resolve customer queries and the number of credit notes caused by data errors. These measures show whether the integration is improving the process, rather than simply moving information between platforms.

Financial measures matter too. Faster order capture can reduce labour costs and improve fulfilment capacity. Accurate stock and pricing can protect margin. Better account visibility can help sales teams convert opportunities without creating avoidable risk. The strongest integration priorities are those that improve both day-to-day control and the organisation’s capacity to grow.

For SAP Business One users with multiple entities, intercompany processes may take precedence. Manual intercompany sales orders, purchase orders, stock movements and invoicing can create delays across the whole group. In that situation, connecting company databases and standardising the underlying process may deliver more value than a channel-specific project.

Build a sequence, not a wish list

The goal is not to connect every application as quickly as possible. It is to create an architecture in which each new integration strengthens the previous one. Start with the revenue-critical or operationally costly data flow, establish clear ownership, and use that result to guide the next phase.

A tailored assessment can turn a long list of frustrations into a practical sequence: first remove the hand-off that limits fulfilment, then improve visibility for customer-facing teams, then extend automation to reporting, suppliers or new sales channels. With the right foundations, integration becomes a controlled investment in accuracy, capacity and profitable growth rather than another system project competing for attention.