From TM-XML-Wiki

Code of the office interested in the record

RecordInterestedOfficeCode (Element)
Type:	ExtendedWIPOST3CodeType
Cardinality:	0..1
Defined in:	BasicRecordType RecordLicenceType RecordNationalInternationalReplacementType RecordOppositionPeriodType RecordShortNotationType

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Implementation-Specific