yeah, resolved thanks Mat
here is the correct structure
<entry>
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.113883.10.20.22.4.503" extension="2023-05-01"/>
<id root="a1b2c3d4-e5f6-7890-1234-567890abcdef"/>
<code code="11341-5"
codeSystem="2.16.840.1.113883.6.1"
codeSystemName="LOINC"
displayName="History of Occupation"/>
<statusCode code="completed"/>
<effectiveTime>
<low value="20150622"/>
</effectiveTime>
<value xsi:type="CD"
code="37-2011.00.028742"
displayName="Odd Jobs Day Worker [Janitors and Cleaners, Except Maids and Housekeeping]"
codeSystem="2.16.840.1.114222.4.5.327"
codeSystemName="Occupational Data for Health (ODH)"/>
<entryRelationship typeCode="REFR">
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.113883.10.20.22.4.504" extension="2023-05-01"/>
<id root="fedcba98-7654-3210-fedc-ba9876543210"/>
<code code="86188-0"
codeSystem="2.16.840.1.113883.6.1"
codeSystemName="LOINC"
displayName="History of occupation industry"/>
<statusCode code="completed"/>
<effectiveTime>
<low value="20150622"/>
</effectiveTime>
<value xsi:type="CD"
code="561720.002294"
displayName="Building cleaning services, interior [Janitorial Services]"
codeSystem="2.16.840.1.114222.4.5.327"
codeSystemName="Occupational Data for Health (ODH)"/>
</observation>
</entryRelationship>
</observation>
</entry>