Hi Tsering,
RA15011 document we put the number having 5,500 pcs by noted invoice of you is well because the correct number will be come after assemble close to finish. QTY can be less or over then invoice we don't correct number in beginning.
About date calculated assembly 600 pcs per day is estimate lead times for planned. If the RA# assemble finished we will change date to actual date.
Thank you,
Tiger.
Tiger.