Batch DTO v9 Batch number is a unique identifier of a batch which groups items (actually "item pieces") together. Field Name Type Category Constraint Reference Description code String Optional length >= 1 & length <= 512 System code of this object, normally this correlates to the erp id given by the source system. item Identifier Optional Item : 17, 18, 19, 20, 21 Item for which the batch is defined. number String Optional length >= 1 & length <= 512 Number of the batch. size BigDecimal Optional Number of items in the batch.