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Messages by which the entries that could not be processed due to a syntax or a formal error are returned from the SIPS system.

The payments system operates on a message-exchange principle, which messages have a precisely defined contents, structure and rules of usage. These details of messages in the payments system are defined in a contract. If an input check identifies a breach of the agreed details, as a consequence a relevant entry is removed from the processing, and a message about a syntax or formal error is generated.