OPC Factory server DDT tags are not read correctly by ignition

HI,

I use OPC factory server to link a M580 schneider PLC to ignition. I created a DDT in the PLC which is a struct of REAL values :

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I created an instance of the DDT named vfd_status_501:

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The instance of the DDT is perceived by ignition, but only as a tag, not as a folder of tags:

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When I read the tag in OPC Quick Client, I get the following message :
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But in OFS client, I see the variables of the DDT correctly:

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What is the issue?

Read the member tags that show up in the browse underneath instead?