A couple of points to add:
* Receipt Date can indeed be valuable in TMF Metrics, but of course it’s difficult to prevent users from “gaming the system” here. We know that Receipt Date must be greater than or equal to Document date, and less than or equal to upload/submission date. But it’s a sort of honor system as to when the document was received for filing in many cases. So it is then worth looking at the difference between document date and receipt date to see how long it is taking to receive a document after it is finalized.
* Certain document types, such as CVs, lab normals, etc. could have a document date that is a long time before receipt date and this is legitimate. For these documents, receipt date is actually more important in reconstructing the trial than document date.