LS Loop Header

To indicate that the next segment begins a loop

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Position

Element

Name

Type

Requirement

Min

Max

Repeat

LS-01

447

Loop Identifier Code

Identifier (ID)

Mandatory

Code identifying loop within the transaction set which is bounded by the related "LS" and "LE" segments (corresponding "LS" and "LE" segments must have the same value for Loop Identifier). (Note: The loop ID number given on the transaction set diagram is recommended as the value for this data element in segments "LS" and "LE".)

One loop may be nested (contained) within another loop, provided the inner (nested) loop terminates before the outer loop. When specified by the standard setting body as "mandatory", this segment in combination with "LE", must be used. It is not to be used if not specifically set forth for use. The loop identifier in the loop header and trailer must be identical. The preferred value for the identifier is the segment I.D. of the required loop beginning segment.

LS is a control segment. LS is always used in conjunction with a corresponding loop trailer (end) - LE, as illustrated below. The LS and LE indicate the start and end of a loop but are not part of the iteration of the loop. LOOP NESTING Loop "A" Header (LS "A") Loop "B" Header (LS "B") Loop "C" Header (LS "C") Loop "C" Trailer (LE "C") Loop "D" Header (LS "D") Loop "D" Trailer (LE "D") Loop "B" Trailer (LE "B") Loop "A" Trailer (LE "A") Neither LS nor LE is used if the data within the loop is not used.

Figures Appendix

Following is a figure detailing the use of the LS and LE segments in conjunction.

LOOP NESTING

Loop "A" Header (LS "A")
            Loop "B" Header (LS "B")
                        Loop "C" Header (LS "C")
                        Loop "C" Trailer (LE "C")
                        Loop "D" Header (LS "D")
                        Loop "D" Trailer (LE "D")
            Loop "B" Trailer (LE "B")
Loop "A" Trailer (LE "A")

Neither LS nor LE is used if the data within the loop is not used.