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7 Fatal Errors to Avoid when Implementing an ERP (and How to Correct Them)

August 18, 2025 by
FLYX
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Implementing an ERP is a major project that can transform your business... or paralyze it for months. After having accompanied more than 30 companies in their transition to Odoo, I identified the recurring errors that cost the most in time, money, and team morale..

In this article, you will discover the 7 most common pitfalls and above all, how to avoid them to ensure the success of your ERP project..


🚨 Error #1: Neglecting the Business Needs Analysis


The typical trap

Many companies rush to the technical solution without analyzing in depth their current processes. Result: an ERP that does not correspond to the realities of the field.


Solution

  • Map your current processes before anything else
  • Identify the points of friction in your workflows
  • Clearly define your business objectives (not technical)
  • Involve all departments from the beginning

💡 Expert advice: Devote at least 20% of your project budget to this analysis phase. It’s an investment that will save you thousands of euros later.


⚡ Error #2: Underestimate Change Management


Why is it critical

An ERP doesn’t just change your tools, it disrupts your work habits. Ignoring the human aspect is running straight towards failure.

Alarming statistic: 70% of ERP projects fail due to resistance to change, no technical issues.


Warning signs

  • Negative comments on the future system
  • Rumors and passive resistance
  • Lack of commitment from the managers
  • Training considered a chore


The winning strategy

  1. Transparent communication from the project announcement
  2. Identification of ambassadors in each department
  3. Progressive and adapted training by profession
  4. Post-go-live support for a minimum of 3-6 months


🎯 Error #3: Wanting To Migrate Everything All At Once


The 'big bang' syndrome

The classic error: migrate all the modules at the same time to "finish it quickly". This is the perfect recipe for chaos.

The recommended phased approach

Phase 1: CRM and Sales (1-2 months) Phase 2: Inventory management and purchasing (2 months) Phase 3: Accounting and reporting (1-2 months) Phase 4: Specific modules according to needs


Advantages of this approach

  • Teams less overwhelmed
  • faster return on investment
  • Possibility to adjust along the way
  • Risk reduction


💾 Error #4: Neglecting Data Quality


The field reality

"Garbage in, garbage out" - If your current data is of poor quality, your new ERP will be too.

Example : An SME migrated 15,000 product references without prior cleaning. Result: duplicates, outdated references, and 6 months of post-migration cleaning.


Action plan for clean data

  1. Full audit of existing data
  2. Cleaning and deduplication before migration
  3. Standardization of formats and nomenclatures
  4. Validation by business users
  5. Tests on a representative sample


👥 Error #5: Train Too Late and Too Little


The symptoms of a failed training

  • Users lost from the first week
  • Return to old tools "temporarily"
  • Multiplication of input errors
  • General demotivation


The effective training method

3 weeks before: General theoretical training 1 week before: Practical training by shift D-Day: Individualized support Week +1 to +4: Daily reinforced support


Types of training to be planned

  • End user training: daily manipulation
  • Super user training: advanced configuration
  • Admin training: maintenance and evolutions


🔧 Error #6: Neglecting User Tests


Why testing is crucial

You wouldn’t launch an e-commerce site without testing it, so why do things differently with your ERP ?

Recommended testing program

  1. Technical tests: basic features
  2. Business tests: real use scenarios
  3. Load tests: simulated peak activity
  4. Acceptance tests: validation by end users

Recommended duration: Minimum 2 weeks of intensive testing before go-live.


📊 Error #7: Missing Post Go-Live Tracking


The most costly error

Thinking that the project is finished on D-Day. In reality, that’s where everything really starts.

Indicators to monitor for the first 3 months

  • Input time compared to the old system
  • Rate of data entry errors
  • Effective use of the modules
  • User satisfaction (weekly surveys)
  • System performance (response time)


Support post go-live essentiel

  • Dedicated hotline the first 2 weeks
  • Reminder training at D+30 and D+60
  • Continuous optimizations according to field feedback
  • Individual support for users in difficulty


🎯 Action Plan: Your Anti-Esh Checklist


Before starting your ERP project :

  • Comprehensive audit of your current processes
  • Clear definition of business objectives
  • Budget including 20% margin for contingencies
  • Dedicated project team with executive sponsor
  • Internal communication plan


During implementation :

  • Weekly progress reports
  • User tests at each phase
  • Progressive formation of the teams
  • Continuous data cleaning

After the go-live :

  • Reinforced support first 3 months
  • Measurement of defined KPIs
  • Collecting user feedback
  • Continuous optimization plan
  • Newcomer training


🚀 Conclusion: Your ERP success in 3 key points


The implementation of a successful ERP is based on three fundamental pillars

  1. Rigorous preparation: analysis, planning, anticipation
  2. Human support: training, communication, support
  3. Continuous improvement: listening, adjustments, optimization

Are you still hesitating about your ERP project? These mistakes may seem daunting, but with the right accompaniment, they are perfectly avoidable.


💬 And You, What Is Your Biggest Concern ?


Share in the comment your main concern regarding your future ERP project. I personally answer each question !




Do you have an Odoo project on hand? Contact us



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