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The report package, folder by folder

A report package is a zip with one folder in it, named like the zip, holding exactly two sub-folders. Everything else about the content can be wrong and still get a feedback file; get this wrong and the answer is NOK in a minute.

635400EWECOAKJOHRI84.IND_IE_DORA010100_DORA_2025-12-31_20260115093000000.zip
└── 635400EWECOAKJOHRI84.IND_IE_DORA010100_DORA_2025-12-31_20260115093000000/
    ├── META-INF/
    │   └── reportPackage.json
    └── reports/
        ├── report.json
        ├── parameters.csv
        ├── FilingIndicators.csv
        ├── b_01.01.csv
        ├── b_01.02.csv
        ├── …
        └── b_99.01.csv
Root folderSame name as the zip without .zip. The ESAs tolerate a mismatch (Roifile reports RF_005); the CBI, CSSF (ICTO010), AFM (103), MFSA, FI and Norway reject it.
Two sub-foldersMETA-INF and reports, nothing else (CSSF ICTO012). No Excel file inside, no readme, no __MACOSX folder from a Mac zip (720).
Table filesLower case, b_01.01.csv to b_99.01.csv, comma-separated, first row the column codes c0010,c0020,…. A capital B or a semicolon fails 720.
EncodingUTF-8 throughout, uniformly with or without BOM (ACPR), and in practice without: a BOM on one file has broken the CBI portal and ANSI on one file has broken OneGate.
Not double-zippedA zip inside a zip is the CBI's second most common upload error.
SizeCSSF 20 MB, BaFin 200 MB; others state no limit.

Download the sample package (a fictional Irish payment institution, validates clean) to see all of it, or drop your own on the validator.

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