FILES A PENDING DRAFT ONLY — NOTHING CHANGES UNTIL A HUMAN REVIEWS AND APPROVES IT IN TAOKEH. Propose a correction to a PURCHASE ORDER that already exists — a wrong quantity or cost, a missing or extra line, the wrong date, term or notes. An admin or bookkeeper reviews a plain current → proposed DIFF and approves. A purchase order posts nothing and moves no stock, so the correction touches no ledger and no stock; a SENT order stays SENT, and Taokeh emails nobody — sending the corrected order to the supplier is the user's own step. ROUTING — (1) the order should not stand: the owner cancels it in Taokeh (Purchase orders → the PO → Cancel); there is no AI lane for cancelling. (2) the order is wrong and not yet received in full: THIS tool — a DRAFT, a SENT or a PARTIAL (partly received) order all qualify. On a PARTIAL order a line that has received goods must keep its product and cannot go below the quantity already received (send it at least that), and it cannot be dropped from lines — the approval is refused by name otherwise; the supplier and currency are frozen once anything has arrived. (3) the order is CONVERTED (received in full, or the rest closed as never coming) or CANCELLED: it is closed to edits — the delivery bills are the documents now, corrected in Taokeh (Purchases → the bill → Edit). A NEW order is create_purchase_order_draft. WHAT YOU CAN CHANGE: poDate, term (null clears it), notes (null clears them) and lines. A purchase order is taxed from its lines' SST codes (rounded per code on the subtotal; an order entered before 7 Oct 2026 keeps the per-line rounding it was saved with), the same as the bill it becomes: a new line inherits the code this order already stores for its product; a new product takes the order's code when every line carries the same one; otherwise it carries no SST (the review shows the new total). An order with NO SST code on any line is taxed at a whole-document rate Taokeh stores only as an amount, so when such a taxed order's LINES change you must also send taxRate (see its field). WHAT YOU CANNOT, each refused by name: the SUPPLIER (an order to someone else is a different order), the PO NUMBER, the CURRENCY or exchange rate, the TAX, and marking sent, cancelling or converting. INVENTORY-ONLY lines, as on create_purchase_order_draft. WHAT HAPPENS ON APPROVAL: the document is updated IN PLACE — same id, same number — through the SAME update Taokeh's own Edit screen runs. Every field you leave out is carried across exactly as it stands (the party, the attention contact, the currency and its frozen exchange rate, the tax) and is never reset. LINES: lines is the FULL replacement set. READ THE LINES FIRST with search_document_lines — each row's lineNo is what a { keep: } entry refers to, and keep is how a line that is already right survives untouched (a measured line keeps its frozen unit and its rounding row). A changed or new line is written in full, in the create tool's line shape, and the server re-derives its quantity and amount. A proposal that changes nothing is refused rather than filed as an empty diff. STALE: if a person edits the document after you read it, the one-tap approval is refused and the reviewer is shown both versions — call revise_draft with this draft's kind to re-read and re-propose. Pass the document's REAL id from search_documents; a document number is refused. A line Taokeh converted from a per-foot or per-piece price prints in tons at a whole-ringgit rate under a note like "(150' @ RM 0.50/feet)": send such a line in its FILED form — thickness, width, tally, unit 'feet' or 'pcs', the per-foot or per-piece price (on a purchase, the supplier's cost) and only the grade as the description, never the printed note. On a correction, a PURCHASE line may instead be sent back exactly as it stands on the document; a SELLING line sent back exactly as it stands is read back into its filed form only when its note's price reproduces it (otherwise keep it with { keep: } where offered, or correct the header only); any other line carrying the note follows the rule for a new line — a selling line read back only at its own tons and rate with no discount, a purchase line refused.