Commercial in Muthari OS claims what was actually done, for contractors who fabricate what they install. The BOQ is broken into zones for execution; when a zone’s quantities run past the BOQ line, a variation is raised and the zone breakdown freezes until it is approved — so the excess is caught before you install it for free. Approved variations and omissions produce a revised contract value that the claim header and the over-billing check both use. A progress claim is a grid of BOQ line by payment stage whose previous quantities are derived from the last invoice, never typed, so double-claiming is structurally impossible — and the goods receipts and work inspections behind each line ride with the claim as its evidence.
A category tree with an approval gate: no claim can be raised until the budget is approved, and the gate is re-checked after lock. Budget versus actual on three axes, where an actual nobody recorded shows as a dash — never as a green zero.
Actuals come from expenses (voided, never deleted), supplier invoices net of back-charges, and certified rework cost. Purchase-order commitments confront the material and subcontract budget and go red on the line when they exceed it.
Quantity-excess variations with a freeze, an approval ladder and an audit trail; remeasured quantities and rates captured on the record. Omissions are negative variations with the sign carried through and the revised quantity clamped at zero. Base plus approved variations is the revised contract value.
BOQ × payment stage grid; previous quantities pulled from prior invoices and re-derived after lock. Value of work done, less advance recovery, less retention, plus VAT. Certification with due-date clocks, payments recorded against the certified amount, every revision kept and none wiped.
A payment-application workbook exported straight from the claim, filters honoured, ready to go to the consultant with the same numbers the system holds.
The quantities a claim stands on come from Site; the commitments it is measured against come from Procurement. Muthari OS is built by contractors in the trade.