The following feedback comes from the Client Philips that we are currently on-boarding to ManTra. It's a result of User Acceptance Testing that we are currently in the middle of.
This is a technical issue. Job metadata are not visible until project reaches pre-processing. I believe that it is because job metada are visible only when they make it to tblInvoicedMetadata. In process like the one that is a subject of our UAT's pre-processing takes some time as we need DTP to convert source files first, so those metadata are not visible for quite a while.