Yes you are correct - this should be assessed as a forecast, and therefore timesheets/invoices should not be necessary as it should be based upon what would have been reasonable to have allowed for it.
However - it doesn't stop PM's from asking. Whilst you should not need to do it, if such paperwork would prove that your assessment was correct I might provide it just to speed up the process - but you are not obligated. They should not be using the benefit of hindsight to prove your quote was wrong - just assessing if that was a reasonable forecast in the first place.
However - it doesn't stop PM's from asking. Whilst you should not need to do it, if such paperwork would prove that your assessment was correct I might provide it just to speed up the process - but you are not obligated. They should not be using the benefit of hindsight to prove your quote was wrong - just assessing if that was a reasonable forecast in the first place.