Show a non-blocking notice below the item table when a line's total proforma
quantity (or amount) — this proforma plus already-issued ones — exceeds the
Sales Order line's ordered value. It updates live as the qty/amount or the
basis changes, and the user can still create the proforma.
Issued-proforma qty/amount are aggregated per line on demand (cancelled
proformas excluded); nothing is stored on the Sales Order.
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