Does the producer identity have to be unique?

[basicdock]

We add producer section for each Indicator as:
indicator:Producer
<stixCommon:Identity id="Identity-XXXXX">
stixCommon:Nameourcompany.com</stixCommon:Name>
</stixCommon:Identity>
stixCommon:Time
cyboxCommon:Produced_Time2021-04-29T00:00:00+00:00</cyboxCommon:Produced_Time>
cyboxCommon:Received_Time2021-04-29T00:00:00+00:00</cyboxCommon:Received_Time>
</stixCommon:Time>
</indicator:Producer>

stix validatation show error:
SCHEMAV_CVC_IDC: Element '{http://stix.mitre.org/common-1}Identity': Duplicate key-sequence ['Identity-XXXXX'] in unique identity-constraint '{http://stix.mitre.org/stix-1}unique-package-id'.", "file:Feed.xml:167:0:ERROR:SCHEMASV:SCHEMAV_CVC_IDC: Element '{http://stix.mitre.org/common-1}Identity'...

I think Identity field in that section must be the same for all our indicators, am i wrong?