SERIES_FORMAT_LOWERCASE_VARS
Lowercase variables detected: {0}. Variables must be UPPERCASE (e.g., '{CODIGO}', '{YYYY}', '{MM}', '{NUM}')
Category: Invoices
Example response
When this error occurs, the API returns a JSON response with the following shape:
{
"type": "https://docs.beel.es/errors/SERIES_FORMAT_LOWERCASE_VARS",
"title": "SERIES_FORMAT_LOWERCASE_VARS",
"detail": "Lowercase variables detected: {0}. Variables must be UPPERCASE (e.g., '{CODIGO}', '{YYYY}', '{MM}', '{NUM}')",
"instance": "/v1/<resource>",
"errors": [],
"success": false,
"error": {
"code": "SERIES_FORMAT_LOWERCASE_VARS",
"message": "Lowercase variables detected: {0}. Variables must be UPPERCASE (e.g., '{CODIGO}', '{YYYY}', '{MM}', '{NUM}')",
"details": {}
},
"meta": {
"timestamp": "2026-05-21T10:00:00Z",
"request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
}
}The type URI is stable and always resolves to this page.
Message
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Tokens like
{0}are runtime arguments — the backend fills them with actual values before responding.
Other errors in this category
ATTACH_SOURCE_INVOICE_UNAVAILABLE
A source invoice is not available (it does not exist or you no longer have access); uncheck the source invoices attachment to send without the folder
ATTACH_SOURCE_INVOICES_NO_SOURCES
The invoice has no consolidation disbursements: there are no source invoices to attach
ATTACH_SOURCE_INVOICES_REQUIRES_PDF
Attaching the source invoices also requires attaching the invoice PDF
ATTACH_SOURCE_PDF_MISSING
These source invoices have no generated PDF: {0}
ATTACH_SOURCE_ZIP_TOO_LARGE
The source invoices ZIP ({0} MB) exceeds the maximum sendable size ({1} MB)