Upload new version of attachment

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1

I’m trying to upload a new version of an attachment but currently it fails with the following error message:
javax.persistence.PersistenceException: org.hibernate.HibernateException: identifier of an instance of com.atlassian.confluence.pages.Attachment was altered from 425066907 to 0

The code is as follow:

Attachment createAttachment(Attachment sourceAttachment, Page targetNodePage, Attachment targetAttachment) {
    Attachment createdAttachment = new Attachment()
    createdAttachment.setContentType(sourceAttachment.getContentType())
    createdAttachment.setFileName(targetAttachment.getFileName())
    createdAttachment.setComments(sourceAttachment.getComments())
    createdAttachment.setFileSize(sourceAttachment.getFileSize())
    createdAttachment.setContainer(targetNodePage)
    attachmentManager.saveAttachment(createdAttachment, targetAttachment, sourceAttachment.getContentsAsStream())
    return createdAttachment
}
2

1/ Take InputStream
InputStream in = sourceAttachment.getContentsAsStream();
2/ Set file size attachment
createdAttachment.setFileSize(sourceAttachment.getFileSize())
↓
createdAttachment.setFileSize(in.available())