Sync Your CRM With Your ERP: Stop Entering Data Twice

Sales closes a customer in the CRM. Admin retypes that customer into the ERP to invoice them. Same customer, same company, two entries — and sooner or later, two different versions of the truth. Syncing your CRM with your ERP means connecting both systems so customers, products, orders and collections flow between them on their own, with a defined "owner" system for each piece of data: the CRM owns the commercial side, the ERP owns the administrative side. A typical two-way sync costs between USD 4,000 and 8,000 and eliminates double entry completely. Here's the full map: what to sync, in which direction, how, and with what results.

The real cost of double entry (that nobody measures)

Before we talk about the solution, let's size up the problem. In a company with 10 sales a day, double entry runs about 15-20 minutes per transaction between typing and verifying: more than 60 hours a month. But the typing is the least of it. The expensive part is the errors: the customer invoiced under their old legal name, the order priced from the previous list, the payment sales can't see — so they keep calling a customer who already paid. Each of those errors costs more than the hour of data entry that created it.

Which data to sync and in which direction

The most common mistake is wanting to sync "everything, in both directions." A healthy sync is asymmetric: each piece of data has an owner system, and the other system receives it. This is the map we use as a starting point:

Data	Owner	Direction	Why
New customers / commercial data	CRM	CRM → ERP	They're born in sales
Tax data (tax ID, VAT status)	ERP	ERP → CRM	Admin validates them
Products and price lists	ERP	ERP → CRM	The ERP is the source of truth
Orders / won opportunities	CRM	CRM → ERP	Closing triggers invoicing
Invoicing and collection status	ERP	ERP → CRM	Sales needs to see it, not edit it
Available stock	ERP	ERP → CRM	So sales doesn't sell what isn't there

Notice the pattern: almost no entity is truly two-way at the field level. The customer travels in both directions, but every field has a single owner. That definition —which is a business decision, not a technical one— is half the success of the project.

Real-time vs nightly batch: when to use each

The two strategies, without dogma:

Real-time (webhooks/events): when the CRM marks an opportunity as won, it fires a webhook and the order shows up in the ERP within seconds. Best for whatever stalls operations when delayed: new customers, orders, credit changes. It's harder to build well (you have to handle retries when the other system is down).

Scheduled batch (hourly or nightly): a process picks up everything that changed since the last run and syncs it in bulk. Simpler, cheaper, easier to audit. Perfect for price lists, consolidated stock, collection status.

The right answer is almost always mixed: real-time for the 2-3 critical events in the sales flow, batch for everything else. Paying for real-time to sync a price list that changes once a week is over-engineering.

Does your team enter the same data into two systems every day? Book a 30-minute call and we'll tell you what it would take to sync them in your case, with concrete numbers.

The real problem: duplicates and conflicts

This is where cheap integrations fail. Three decisions you have to make before writing any code:

1. The matching key. How does the system know that "San Martín Distributors LLC" in the CRM is the same customer as "SAN MARTIN DISTR." in the ERP? For business customers, the tax ID is the natural key. Without a reliable unique key, you have to create one first.
2. The initial deduplication. Every CRM and every ERP with years of use has accumulated duplicates. If you turn on the sync without cleaning up first, the integration multiplies duplicates across both systems. The initial cleanup can be half the project, and it's the half that leaves the most value.
3. The conflict rule. The same field was edited in both systems on the same day: who wins? The healthy answer comes from the ownership map above (the field owner wins). For the gray cases, a human review queue is more honest than an automatic rule that silently overwrites data.

What it looks like with common stacks in Argentina and LATAM

• Tango Gestión + HubSpot/Pipedrive: the most frequent request we get. Tango has integration options depending on the version and the modules you've licensed; when those fall short, you work at the database level very carefully. If your ERP exposes nothing at all, see how to connect a system without an API.
• Odoo as the ERP: the friendly case — Odoo has a complete, documented API, and syncing it with almost any CRM is straightforward. Sometimes the answer is even to use Odoo's own CRM and drop the integration altogether.
• HubSpot + a local or custom ERP: HubSpot has an excellent API on the CRM side; the challenge is usually on the ERP side. The integration is built as an intermediate layer that talks to both: classic API development work.
• Custom CRM: when the CRM is your own, the sync is designed from the inside and is the cleanest of all. It's one of the reasons many companies end up with a custom CRM: it adapts to the ERP they already have, not the other way around.

A case with numbers: distributor, 40 orders a day

A distributor with a field sales team was entering orders in the CRM, and two people in admin were retyping them into the ERP. We measured one month before integrating: 23 data-entry errors detected (old prices, duplicate customers, mistyped quantities), of which 6 reached the end customer as an incorrect invoice — with its credit note, its phone call and its wear and tear.

We implemented a mixed sync: a won order travels in real time to the ERP; prices, stock and collections come back to the CRM in an hourly batch, on top of an initial deduplication by tax ID that merged about 400 repeated customers. Three months later: data-entry errors: zero (the category stopped existing, there's no retyping to get wrong), and the two admin people went from entering orders to handling exceptions and collections. The project paid for itself in under 5 months on hours alone, not counting the incorrect invoices that stopped going out. For more on the price ranges of this kind of project: how much an API integration costs in 2026.

When NOT to sync (yet)

• You're going to replace one of the two systems within the year. Don't integrate what you're about to switch off. If the ERP is at the end of its life, maybe the right project is a new management system, with the integration designed in from the start.
• Your sales processes aren't defined yet. If every rep uses the CRM their own way, the sync will carry that chaos into the ERP. Process first, integration second.
• The volume doesn't justify it. At 2 sales a week, double entry is annoying but it isn't bleeding you. There are better places for that USD 5,000.
• The data is very dirty and nobody can decide. Deduplication needs a business owner who can say "this customer is this one." Without that person, the project gets stuck.

The next step

Start by measuring one week of double entry: how many records, how many minutes, how many errors reached an invoice. With that number in hand, the decision makes itself.

At Deepyze we've spent years connecting CRMs with ERPs for companies in Argentina and LATAM — Tango, Odoo, HubSpot, in-house systems — as an integration project or inside custom software builds. We work at a fixed price (no "little hours" that pile up), we send the proposal within 24 hours, and the team is in your time zone to resolve things same-day when something needs it. Tell us which CRM and which ERP you use and we'll tell you exactly what it would take to sync them.