ERP and CRM: differences, complementarity and integration

Definitions: ERP and CRM, two distinct building blocks

An ERP is an integrated management software that centralises internal processes: accounting, commercial management (quotes, orders, invoicing), purchasing, inventory, and sometimes production, payroll or HR.

A CRM is a software that centralises interactions with prospects and customers: contact details, interaction history, sales opportunities, marketing campaigns, and support tickets.

In simple terms: the ERP manages what happens inside the company, while the CRM manages what happens between the company and its market.

What are the concrete differences?

The major differences lie at several levels:

• Primary users: finance, supply chain, and sales admin for the ERP; sales, marketing, and customer service for the CRM.
• Core data: products, orders, invoices, and stock for the ERP; contacts, opportunities, and campaigns for the CRM.
• Time horizon: the ERP is focused on operational execution, whereas the CRM focuses on long-term relationship management.
• Usage style: the ERP is often perceived as a tool for constraint and structure, while the CRM must first and foremost be adopted by teams to deliver value.

Why the two are complementary

A salesperson using the CRM needs to know if an invoice is overdue before following up with a client. A sales admin team in the ERP needs to know which account manager is in charge of the account. A director needs to consolidate actual turnover (ERP) and the forecast pipeline (CRM) to steer the business.

Without integration, teams manually re-enter data from one tool to another, leading to errors and wasted time. With a well-designed integration, each tool serves its specific purpose while relevant information flows between them.

How to integrate ERP and CRM

Several approaches exist, to be chosen based on the company's maturity:

• Synchronisation of customer accounts and contacts between both tools.
• Reporting of invoices, payments, and outstanding balances from the ERP to the CRM.
• Pushing signed purchase orders from the CRM to the ERP.
• Sharing the product catalogue and price lists from the ERP to the CRM for quoting.
• Consolidated dashboards merging sales and financial data.

Common mistakes

Typical pitfalls on this subject:

• Trying to make the CRM perform the ERP's role (or vice versa) to save on software costs.
• Launching an integration without first aligning master data (customers, items).
• Synchronising too much data without clarifying which system is the single source of truth.
• Underestimating the cost and duration of an ERP/CRM integration project.

Questions to ask yourself

To frame your ERP/CRM strategy:

• What information needs to flow between the two tools?
• Which system is the source of truth for each data point (customer, product, pricing)?
• What is the current maturity level of our ERP?
• What will be the impact of changing one system on the other in 3 to 5 years?

Going further

To learn more, see our article on core CRM features, our CRM definition guide, and our breakdown of the differences between sales, marketing, and service CRM.

Key takeaways

• The ERP manages internal flows (finance, inventory, production), while the CRM handles relationships with prospects and customers.
• The two tools are complementary rather than competing.
• Without integration, teams end up re-entering information, leading to a loss of data reliability.
• A well-designed integration ensures the flow of relevant data while keeping each tool focused on its specific role.
• Before integrating, it is essential to clarify which system serves as the source of truth for each data point.

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