# CRM and ERP integration: how to connect your company’s information islands Source: https://baqueiro.es/en/automatizacion/crm-erp-integration-connect-data/ Published: 2025-07-02T06:56:00+00:00 Updated: 2025-07-02T06:56:00+00:00 Author: Baqueiro Desarrollo Web Language: en-US Usage: Attribution required: quoting allowed with a visible link back --- **TL;DR** - When your CRM and ERP aren’t integrated, the company pays twice for the same piece of data: once to enter it and once to reconcile it. - There are 3 common integration patterns: one-way sync, two-way sync and centralized orchestration. - Choosing between an off-the-shelf connector and a custom integration depends on data volume, sync frequency and how complex your business logic is. There’s a conversation that happens in almost every company that has grown organically. The sales team works in a CRM. Operations works in an ERP. Accounting has its own system. And at some point someone realizes the same information is being entered 3 times in 3 different places. Sales has a client as an “open opportunity,” operations as an “order in progress” and accounting as an “outstanding invoice.” When someone asks what’s going on with that client, each department gives a different answer. The problem isn’t that the systems are bad. The problem is that they aren’t connected. ## The symptom: when data lives in too many places Information silos don’t appear overnight. They start with small points of friction that end up feeling normal: - The salesperson who exports a spreadsheet from the CRM to hand over to admin. - The technician who updates an order status in the ERP without knowing the client has already agreed a change with sales. - The team meeting where nobody has the same numbers because everyone is looking at a different tool. Over time, that friction turns into process: someone ends up syncing the systems by hand every day or every week. Human error creates discrepancies, discrepancies breed distrust in the data, and that distrust leads teams to stop using it to make decisions. **The cost of this problem almost never shows up in a report.** It’s spread across hours of duplicated work, errors that get fixed too late and decisions made with incomplete information. We cover it in more detail in [what a company gains when its systems stop working in silos](https://baqueiro.es/en/automatizacion/data-silos-connect-business-systems/). ## What exactly is CRM and ERP integration A CRM and ERP integration is a mechanism that makes data flow automatically between the 2 platforms, with no manual work, so each system has the information it needs when it needs it. Technically, it almost always relies on each tool’s [API](https://baqueiro.es/en/codigo-que-trabaja-por-ti/what-is-an-api-and-why-it-matters/) and, when you need things to happen instantly, on [webhooks](https://baqueiro.es/en/codigo-que-trabaja-por-ti/what-is-a-webhook-and-what-is-it-for/) that announce every change. **Integrating doesn’t mean merging.** The CRM and the ERP remain separate systems, with their own screens and their own data models. The integration defines: - What data is shared. - In which direction. - How often. - With what transformation logic. That last part, the transformation logic, is where almost all the complexity lives. The CRM calls an “opportunity” what the ERP calls an “order.” The “status” field has 5 possible values in the CRM and 8 in the ERP. The client has one ID in the CRM and a different one in the ERP. Mapping those differences correctly is the core of a good integration, and it pays to start with a simple table: each field, its name in each system, which system owns it and what happens if it arrives empty or with a value the other system doesn’t recognize. ## The 3 most common integration patterns ### Pattern 1: one-way sync One system sends, the other receives. The most common case: the CRM sends closed orders to the ERP and the ERP sends nothing back. **Upside:** it’s easy to build and easy to maintain. **Downside:** if the ERP has information sales cares about (delivery status, outstanding balance), that information never arrives, and someone has to go and look it up by hand. ### Pattern 2: two-way sync Data travels in both directions. Orders go from the CRM to the ERP, their status comes back to the CRM, and client data stays the same on both sides. **Upside:** you get a complete view of the client without switching tools. **Downside:** when both systems change the same piece of data at once, you have to decide which one wins. Handling those conflicts isn’t trivial, and it’s worth writing the rules down before you start. ### Pattern 3: centralized orchestration Instead of connecting the CRM and ERP directly, you put a component in the middle (middleware or an integration platform) that receives events from both, applies whatever logic is needed and sends the data where it has to go. **Upside:** if you add a new system tomorrow (online store, support desk, invoicing), you connect it to that central piece rather than to each system separately. **Downside:** the upfront cost is higher. Even so, once more than 2 systems share data, it’s usually the option that scales best. ## Common examples in Spanish companies ### HubSpot and Holded A frequent combination in service-based small businesses: HubSpot for sales and Holded (a Spanish business management platform) for invoicing, accounting and inventory. A typical integration includes: - Contacts and companies synced across the 2 systems. - Deals closed in HubSpot that create invoices or orders in Holded. - Payment status from Holded visible on the client record in HubSpot. If your workflow is standard, there are connectors that do the job. If you have your own logic (pricing by client type, tiered discounts, multiple warehouses), you need something custom. ### Salesforce and SAP The classic large-enterprise combination: Salesforce for the sales cycle and SAP for operations, inventory and accounting. Integrating them is a serious project, usually with an integration platform such as MuleSoft or Boomi in the middle. The main challenge isn’t technical, it’s data governance: who owns each piece of data, who updates it and who answers when something doesn’t add up. ### Pipedrive and Odoo For those who want more control than a closed connector offers, without the cost of a Salesforce and SAP style project. Pipedrive is a CRM built around the sales pipeline; Odoo is a modular open-source ERP that covers everything from invoicing to HR. **Extra complexity:** Odoo’s data model is broad and every installation tends to have its own custom modules and fields, so few integrations look alike. If volume is high, also check the request limits on Pipedrive’s API. ## Off-the-shelf connector or custom integration: how to decide | | Off-the-shelf connector | Custom integration | | --- | --- | --- | | Data flows | Simple and predictable | With specific business logic | | Data transformation | Direct field mapping | Complex or conditional transformations | | Sync frequency | Periodic (hourly, daily) | Real time or near real time | | Data volume | Low or medium | High or with significant spikes | | Maintenance | Handled by the connector vendor | Needs your own technical team or a partner | | Upfront cost | Low (monthly subscription) | Higher upfront investment | | Flexibility | Limited to what the connector allows | Full: it fits your processes | ## The cost of not integrating: a simple calculation Take a company with 10 people in sales and 5 in admin, with no integration between CRM and ERP: - If each person loses just 1 hour a week entering data twice, looking for information across systems or fixing errors, that’s 15 hours a week. - Over roughly 46 working weeks, at a cost of €25 an hour, that comes to about €17,000 a year. At 2 hours per person, about €34,500. Then there are the errors, which are harder to quantify: - Orders processed with wrong data because the ERP didn’t have up-to-date information. - Clients receiving the wrong messages because the CRM knew nothing about an issue. - Sales decisions based on data that doesn’t reflect what’s actually happening in operations. As a ballpark, a well-designed integration between 2 systems with modern APIs can run from about €3,000 to €15,000, depending on the number of flows and how complex the logic is. With numbers like these it often pays for itself within the first year, but run the math with your own data. ## Frequently asked questions ### Do I have to switch CRM or ERP to integrate them? Almost never. The integration uses the APIs of the systems you already have; it doesn’t replace them. The exception is a system so old that it has no API and no way to export structured data. In that case integration is more complex, or simply not viable without upgrading that system first. ### How long does it take? For a standard two-way integration between systems with modern APIs, a reasonable timeline would be: - 1 to 2 weeks of analysis and design. - 2 to 4 weeks of development and testing. - 1 to 2 weeks of go-live and fine-tuning. In total, 4 to 8 weeks. With complex logic or legacy systems, it can stretch to 3 or 4 months. ### What if one of the systems updates and changes its API? That’s the main risk. Reputable vendors give plenty of notice before retiring old API versions, but someone has to be watching for those notices. A well-built integration includes alerts when an API call fails, so your team can act before the failure causes problems, and enough documentation for any developer to understand what each flow does. Without it, every change turns into archaeology, as we explain in [the hidden cost of poorly documented automations](https://baqueiro.es/en/automatizacion/hidden-cost-poorly-documented-automations/). **Maintaining an integration is ongoing work, not a one-off project.** If your team spends hours entering data that already lives in another system, we can review your workflow with you on a 30-minute call, no strings attached, to see where information gets stuck and how much time you could win back. [Get in touch](https://baqueiro.es/en/contact/) and we’ll take a look.