Dear Paulino ,
Kindly find the attached sheet after check it and found some mistakes , you can check the difference by click over the work package total , you will find that the blank has the value equals to the difference and this is because the sheet collect also the subtotal for the pages and this makes the difference
You can check the photos also , the attached file in this lesson which is BOQ bank contains the check sheet for reviewing the results with it
Thank you ,
Regards,