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.

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