What are the most common reasons an invoice gets disputed or rejected?

The most frequent issues we see are:

• Missing or incorrectly formatted CDR file
• Using internal CPO session IDs instead of the external roaming session IDs
• Sessions in the CDR file that don't match what was transmitted via the platform
• Tariff deviations (prices invoiced don't match agreed tariffs)
• Duplicate sessions (same sessions sent in multiple invoices)
• Sessions that are technically implausible (e.g. under 1 minute or below 0.1 kWh - these are not billable)