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Changes between Microsoft Axapta 3.0 and Microsoft Dynamics AX 4.0, and implications for upgrade

Record identification: Change of allocation principles - In Microsoft Dynamics AX 4.0 the record identification allocation has changed from per company to per table. This means that record identifications can no longer be assumed to be unique across a company. As a consequence, application code that refers to record identifications should be carefully reviewed and code that relies on unique allocation within a company must be modified.