Annotated X12 850 Purchase Order

An X12 850 is a transaction set inside ST/SE, commonly within GS/GE and ISA/IEA envelopes. Identify the actual separators from ISA before splitting the text.

Read outside inward

Check ISA13/IEA02, GS06/GE02, and ST02/SE02 as exact strings. SE01 declares the segment count from ST through SE. BEG commonly carries purchase-order purpose, type, number, and date, but the partner guide determines required elements and codes.

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