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The Greek tax authority (IAPR) requires the invoice type to be specified as part of the invoice. In GOBL, this type can be set using the gr-mydata-invoice-type extension in the tax section and setting the GOBL invoice type to other.Alternatively, GOBL will set the extension for you based on the type and the tax tags you set in your GOBL invoice. You can read more in the GOBL Greece Tax Regime readme.If you produce a PDF version of the invoice, the invoice type label will be displayed instead of โ€œInvoiceโ€.
For further details on how GOBL prepares data for conversion, see the Greek Tax Regime.
If you issue a credit note shortly after the invoice it refers to, the MyDATA system may reject it because the original invoice hasnโ€™t completed synchronization. Youโ€™ll typically see an error like:
Fatal error 301: Invoice with ฮœฮ‘ฮกฮš xxxx not found for VAT number xxxx
This happens because there can be a delay between when an invoice is accepted by MyDATA and when it becomes fully available for reference by other documents like credit notes. This delay can range from a few minutes to several hours, depending on MyDATA system load.Solution: If you receive this error, retry issuing the credit note after waiting some time. You may need to wait anywhere from a few minutes to several hours for the original invoice to be fully synchronized in the MyDATA system before the credit note can successfully reference it.

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