Blog
Articles on ERP module development, implementation strategy, and business system integration — approval workflows, accounting modules, and Indonesian compliance.
77 articles
How to reconcile a cash advance against category-tagged expense lines in an ERP, and why VAT on each line stays informational unless a tax-invoice number exists.
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Model a contract as billing-schedule rows, period 0 as the down payment, each with a planned amount and a unique invoice link, so no period is billed twice
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How to correct a paid payroll run without touching it: an amendment record links the closed run to a draft revision, with a reason, a creator and an audit trail.
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How to design the tools an AI agent calls inside an ERP: separate read, draft and post tiers, narrow typed arguments, idempotency keys on every write, branch scoping from the token, model-readable errors and a per-run audit trail.
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An accounts-payable agent that reads a supplier invoice PDF, matches it against the purchase order and goods receipt in code, explains every variance, and drafts the AP entry. Posting pauses for a human through needs_approval, and tool guardrails keep the agent inside the clerk's branches.
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ERP requirements arrive as edge cases, not specs. How I turn them into testable acceptance criteria, a worked-example table and an ambiguity log.
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The module was nine hundred lines and its only specification was a commit message from 2017. Here is the method that survives that: characterisation tests first, then seams, then narrow agent-led extractions, and the four modules an agent never touches alone.
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An agent cannot infer that a journal in a closed period is untouchable, that every query is scoped to a branch, or that document numbers are gapless. Here is how I packaged those rules as a Claude Code plugin, and which mechanism carries which rule.
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Wiring an ERP-backed POS to a 58 mm Bluetooth printer in Flutter: offline outbox, idempotent reprints, a printer port abstraction and field rollout.
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The TM-T82 does not print HTML. Here is the byte-level path that actually works: transports, ESC/POS commands, 48-column arithmetic and code pages.
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The three ESC/POS features a POS actually depends on: the drawer kick pulse, cutting without slicing the total, and reading real-time printer status.
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What Coretax DJP changed for e-Faktur and e-Bupot, and the three things every ERP developer must handle: 16-digit NPWP, auto-generated tax invoice numbers, and the new XML import.
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How I built the kasbon flow end to end in a real carwash ERP — request, cash-session disbursement, piutang tracking, and automatic payroll deduction.
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How I designed opening float, cash-in/out, expected-vs-counted variance, and an append-only audit trail for a real Indonesian carwash POS.
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How to design stock opname in a custom ERP so it stops being a once-a-year freeze: snapshot vs live counting, ABC cycle-count scheduling, variance approval, and correct adjustment posting.
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The invoice price on a purchase order is never the real cost of imported goods. Here is how to build a landed cost engine that apportions freight, insurance, bea masuk import duty, and PPN across purchase lines for accurate inventory valuation.
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A practical walkthrough of the quote-to-cash pipeline in a custom ERP, from quotation and sales order through delivery, invoicing, and payment matching, anchored by the state machine that keeps it all consistent.
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How to design multi-company support into a custom ERP: shared master data, intercompany invoicing, automatic elimination entries, and consolidated reporting.
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How to model consignment inventory in a custom ERP, separating legal ownership from physical possession, and firing the right ledger entries only when the end customer actually buys.
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A practical walkthrough of wiring NPWP validation, PPN at 12% on DPP nilai lain, NSFP invoice numbering, and Coretax XML exports into a custom ERP for Indonesian PKP businesses.
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How to design batch and serial-number traceability into a custom ERP, covering receiving, movements, FEFO picking, and recall reporting for regulated inventory.
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How to design the double-entry general ledger at the heart of an ERP system, from chart of accounts to trial balance, using PostgreSQL constraints and triggers to make unbalanced entries impossible.
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How to model multi-level bills of materials and material requirements planning in a custom ERP, from work orders to backflushed stock.
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How to design a fixed asset module for a custom ERP, from asset registers through straight-line and declining-balance depreciation to disposal and monthly GL posting.
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