属性
数据类型N
必须?Optional
长度Min 1 / Max 1
Element
X12 EDI Release 00504
E13
489Loop Level Number
A number used by the electronic form of the X12 standards to specify the loop level of a segment within a transaction set; it is 1 for the first loop level and is incremented by 1 for each succeeding loop within a loop level
