Hello,
in Slovenia we have 3 mandatory fields that are missing in your app for transfers and they are much needed for current .
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Reason Code - 4 letter field (ISO 20022 purpose codes table)
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Payment purpose (EPC QR - Remittance Information) - Alpha numeric text up to 140 characters, no leading or trailing spaces.
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Reference (we have our national standard with SI refences but will be replaced some day by the sepa RF standard)
All three fields are mandatory in Slovenia and would be best if you updated your app to be compliant with this.