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Does the shipment reference number (SRN) have to be unique for five years?

April 26, 2017Reference shipment SRN

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Does the shipment reference number (SRN) have to be unique for five years?

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Currently due to system support, the shipment reference number must be a unique and never repeated (see FTR Letter No. 2). The Census Bureau is reviewing system enhancements to allow the reuse of the SRN.