The order change number, set by the buyer.

ordchg_Examples
 <documentReference documentType="OrderChange" id="Sample_OC0000105" date="2020-08-26" lineNo="1">
ordchg_XPATH

/b24Message/orderChange/item/documentReference[@documentType="BuyerOrder"]/@id

ordchg_Edifact_Path
ORDCHG.LIN.RFF.C506.1154
ordchg_Edifact_Qualifiers
ORDCHG.LIN.RFF.1153 = PP
ordchg_edifact_sample
RFF+PP:555666' DTM+171:20200826'
ordchg_Required
Yes
ordchg_Type
Text
ordchg_Sort
11700
Subscribe to (Item/Line) : Order change id