Adds two PO-level charges shown below GST, per issue #133 ask 2.
- Stored as ABSOLUTE rupee amounts on PurchaseOrder.tcsAmount / discountAmount
(Decimal?, default 0; null/0 on historical & imported POs). Migration added.
- Discount is applied post-GST. totalAmount folds the charges in (net payable =
subtotal + GST + TCS − Discount), so payments / reports / advance all use the
true amount due. lib/po-money.ts is the single source of truth.
- Forms (create + edit) render a shared TcsDiscountFields with a % control
bidirectionally linked to the rupee value (percentage is convenience only,
taken against the GST-inclusive total; only the absolute amount is persisted).
- createPo / updatePo store & compute; both manager-edit actions PRESERVE the
PO's TCS/Discount when recomputing the total; import leaves them at 0.
- PO detail shows TCS / Discount / Net payable below GST; PDF + XLSX export show
the same breakdown and a corrected grand total.
Tests: lib/po-money unit tests; po-tcs-discount integration test (create / edit /
manager-line-edit preservation). Docs: CLAUDE.md GST section + wiki Purchase
Orders (TCS/Discount + a full "what import sets vs. not" field-mapping table).
Full unit (360) + integration (305) suites green; tsc clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Hardik
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