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Error

FX-SCH-A-001020: A line attachment needs an allowed file-type code

In short

Error: fails the selected checks.

FX-SCH-A-001020 means a non-empty mimeCode on an embedded attachment in your line's document reference is not allowed by the Extended profile. Correct an inaccurate MIME value or convert the attachment to an allowed format.

On this page

What it means

This rule checks mimeCode on ram:AttachmentBinaryObject inside a line's ram:SpecifiedLineTradeAgreement/ram:AdditionalReferencedDocument against file-type list 19. An empty value passes. FX-SCH-A-001019 checks attribute presence only. Neither test verifies the attachment's actual format.

Why it matters

The profile restricts the declared MIME types of embedded attachments. An unlisted type does not establish what software the recipient can use.

How to fix it

Check the actual file format. If it is allowed, use its exact MIME value, such as application/pdf for a PDF. Otherwise, convert the file to an allowed format and update the embedded data, mimeCode and filename. Changing only the label or file extension does not convert the file. Export and recheck.

Once the file is corrected, check it again for free: Validate a ZUGFeRD invoice

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice Beta

The rule as published

Value of '@mimeCode' is not allowed.

Where this rule applies

Rule set Version
Factur-X 1.09 EXTENDED 1.0.9-2
ZUGFeRD 2.5 EXTENDED 2.5.2
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether FX-SCH-A-001020 still fails, and which other rules do.

Updated 6 November 2026