The else branch in CreateForSourceWithProgress was reading from
qt_lot_metadata (estimate snapshot) for any source when no items
were provided. This caused estimate prices, coefficients, manual
prices and meta_prices to be copied verbatim into competitor/warehouse
pricelists when called with empty item list.
Fix: else branch is now guarded to source=="estimate" only.
Any other source with no items returns an explicit error instead
of silently falling back to estimate data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
592d77e30b