Data migrated but reports are incorrect after Odoo Implementation. How to fix this?

[vihanrichard]

Yes, this can happen during Odoo Implementation and Odoo ERP implementation. When the data exists in the system but the reports don’t match, the root cause is usually linked to how the data was imported or structured.
Here’s what usually causes it:

• Field mapping in import sheets not aligned with Odoo columns
  
• Missing relational links (customers, products, taxes, journals not connected)
  
• Incorrect formats for date, time, or timezone
  
• Importing transactions before master records
  
• Many2one/One2many fields not mapped properly
  

Here’s what to do:

• Import master data first (customers, products, taxes, accounts) before invoices or orders
  
• Use proper import templates, don’t rename columns without mapping checks
  
• Validate data with small batches before full migration
  
• Ensure relational IDs like external_id correctly link parent records
  
• Match timezone, date, and decimal formats to avoid wrong calculations
  
• Recompute fields if reports depend on stored values
  
• Debug mismatches via Developer Mode → Technical View → record relations
  

In most cases, fixing the import order and relational mapping corrects the reports without re-migrating everything.