[EDI-L] Tech question about Control number

[whsu]

Hi, all, Control number data elements in ISA, IEA, GS, and GE are of type N0 with max of 9 characters. However, ST and SE control number type is AN with 4 to9 characters. Anyone has a good answer?  Is "ABCD" a good control number? Thanks. WJ Hsu 













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