Weighted Average COGS in DAX — one calculated column, every downstream report #PowerBI #DAX

**Description:**
The textbook WA cost formula:

WA = total inwards value / total inwards quantity

In DAX, against an inventory movement fact table, it's one calculated column:

WA_RATE = INVENTORY_MOVEMENT_SUMMARIZE_DAILY[CLOSING_BALANCE_VALUE]
/ INVENTORY_MOVEMENT_SUMMARIZE_DAILY[CLOSING_BALANCE_QTY_INVENTORYCALCULATION]

Compute once, per stock item, in the fact table. Then every downstream COGS measure, every margin visual, every inventory waterfall chart references the same WA_RATE column. No drift across reports.

The waterfall chart on screen — fiscal years 2018, 2019, 2020, 2021, broken down by stock group (BAGS_MODULE_1, SOFA-1, SOFA-3, TV_MODEL_1, etc.) — is rendered directly from WA_RATE applied to credit and debit movements.

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