Hi Magnus,

Yes, you can create your own statement GUIDs. They are, in essence, nothing but the entity ID and a random number.

$guid = $entityId->getSerialization() . '$' . trim( com_create_guid(), '{}' );

https://github.com/wmde/WikibaseDataModelServices/blob/master/src/Statement/GuidGenerator.php#L37
https://github.com/wmde/WikibaseDataModelServices/blob/master/src/Statement/V4GuidGenerator.php#L26

I hope that helps. Sorry, no guarantee, Editing via action=wbeditentity should always work, but you will probably run into the same issue.

Best

Thiemo

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