Update Sales orders created manually through FBDI?

Summary:

Hi Forum members,

I am trying to update a sales order which has been created manually via FBDI. Specifically trying to update line EFF. However the import keeps failing , I have tried multiple approaches and have even enabled the profile option "FOM_IMPORT_VIA_REST_BACKEND"

but nothing has worked. If someone can provide a working template where manually created sales orders are revised through FBDI it would be of utmost help

Thanks!

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