From the measurement book to the bill
A SuperWise measurement sheet keeps each line of the measurement book, not a summary: the location, the number, length, breadth, height and deduction, with the net quantity worked out. A sheet names its BOQ item and work order, and approving it updates the BOQ progress.
An RA bill covers an execution period and reads its quantities from approved sheets and its rates from the work order. The system refuses a cumulative quantity above the work order quantity, and the work order detail shows the balance on each line. Retention is the bill amount times the work order's retention percentage, and the mobilisation advance is recovered pro rata or as a lump sum.
When scope changes after approval, the work order is amended. The amendment raises the revision, keeps the earlier version and records the reason, and later bills use the amended lines.