IIM for web compatibility

[EtMRS]

Somes of our pictures are exported to an internet photo gallery since a very long time. So, this gallery uses IPTC IIM to retrieve information about pictures (Description, Title, Copyright, GNSS) But Photo Supreme don't export this format but the new IPTC/XMP, following the IPTC recommendation.
So, I need to synchronise both ( https://getpmd.iptc.org/getiptcpmd-guide.html#insync1.
Now, I use a third party application to do it : my old DAM, Exiftool or GNSS application. But; it's only a read/write process : application read IPTC/xmp and write both IPTC/xmp AND IPTC/IIM.
Is it a way to make the synchro in PSu only ?

[Hert]

Photo Supreme writes legacy IPTC (IIM) for applicable metadata fields (metadata field that also exist in IPTC-IIM).

[EtMRS]

Hert, Yes, it's working fine. We can't reproduce this issue, so, can you delete this post ? Thks