From GRN to GL: Why Your Two Books Disagree
Ask the store how much fabric came in last month and you get one number; ask accounts and you get another. Both are honest. They are reading different books, connected by a chain of postings that most factories never look at end to end, which is why month-end reconciliation is a ritual of surprises. The chain deserves to be understood, because when it is wired correctly the two books cannot disagree.
From gate to ledger
The chain has four links. A goods receipt records that material arrived: quantity, lot, against a purchase order. The store's stock ledger gains a lot at a quantity, the material truth. In parallel the finance ledger should gain the mirrored value: inventory debited, the supplier liability credited, at the receipt's cost. Issues to production post the reverse, stock down, work-in-progress value up; and adjustments, returns, and write-offs each carry their own paired posting. One physical event, two ledgers, one document linking them. Break any link, a receipt that never reaches finance, an issue recorded in kilograms but never valued, and the books begin their separate lives.
Where the chain snaps in practice
Three habits do most of the damage. Receipts posted without a unit cost, because the invoice came later, flow zero value into finance while the store shows full quantity; the fix is posting at the purchase-order price and letting the invoice difference post as its own adjustment. Stock corrections made directly in the store, the recount, the "found" roll, without a document, change quantity while value stands still. And subcontract movements, fabric sent out for dyeing job-work, are the classic leak: material leaves the store's book but the value posting is forgotten because nothing was sold or bought.
Why the wiring pays
A factory whose GRN-to-GL chain is unbroken gets three things without further effort: month-end inventory valuation that is a report rather than a project, per-order material cost that comes from documents (the input that makes actual costing honest), and a lot record that carries value as well as identity. The test is the same as every records discipline: pick one delivery and follow it, gate to ledger, without leaving documents. If you can, the books agree by construction. If you cannot, month-end already told you.