The Item Card in Microsoft Dynamics 365 Business Central might seem basic, a place to put the basic product details like description, cost, and inventory levels. But the moment you post a transaction, a purchase, sales order, or transfer, the Item Card springs to life.  Behind all that, there is a complex choreography of costing, ledgers, reservations, availability, and so on. That’s what, in fact, makes Business Central so powerful. This blog reveals the secret life of an Item Card in Microsoft Dynamics 365 Business Central and describes what happens under the hood when you hit Post.  1. The Item Card Isn’t Just a Form, It’s a Control Centre  Think of the Item Card as the command hub for everything related to your product.  Each domain drives how BC will treat transactions, cost, reservations, or replenishment.  2. How the Item Card Handles the Purchase  Posting a Purchase Order receipt triggers the following actions in Business Central:  a. Item Ledger Entries are created.  BC pens a new entry recording:  This becomes part of the item’s inventory history.  b. Value Entries are generated  These store the financial impact of the receipt, including:  c. Costing Method decides valuation  Depending on whether the item uses FIFO, Average, Standard, LIFO, or Specific, BC assigns cost layers differently.  d. Availability updates instantly  On-hand inventory increases the moment the receipt posts. Behind the scenes, the Item Card updates fields such as:  3. Sales Posting: How BC Depletes Inventory and Calculates Cost of Goods Sold  When you post a Sales Shipment or Invoice, the Item Card invokes its costing logic:  a. Inventory is reduced  BC identifies which cost layer to use based on the costing method and reduces on-hand quantity.  b. Outbound Item Ledger Entry is created  Documenting:  c. Cost of Goods Sold is calculated  Value Entries are made by using the correct cost layer.  For instance,  Every outgoing transaction refers to its precise incoming origin.  4. Routine of Cost Adjustment Begins to Work Silently  If costing isn’t fully known at posting for example, expected cost, then BC schedules Adjust Cost, Item Entries in the background.  This process:  This is the reason you might see cost adjustments “jump” into financial reports later.  5. Reservations & Item Tracking Kick In  When you post, BC checks:  Item Card settings determine whether the system:  Item tracking ensures traceability at every stage for inventory.  6. The Replenishment System Wakes Up  Posting a receipt or shipment may trigger planning actions:  This is where the Item Card acts as a feeder into Business Central’s full planning engine.  7. Posting Groups Determine the Financial Effect  Posting of an item is not just an inventory update; it is an accounting event.  The Item Card’s Inventory Posting Group and General Posting Group determine which G/L accounts are used for:  When you post, the Item Card sends instructions to the G/L via Posting Groups.  8. The Item Card Updates Its Own Statistics  After every posting, BC updates key fields automatically:  These fields become the source for reports such as:  9. If posting is wrong, reverse transactions activate  When users reverse a transaction, BC doesn’t delete anything.  Instead, it creates:  The Item Card assures full auditability.  10. All This Happens in Seconds Automatically  Every click of Post runs a full chain reaction:  All powered by the humble Item Card.  Concluding Remarks:   The Item Card in Microsoft Dynamics 365 Business Central is the brain of Inventory within Business Central. What seems to be a simple product record is a deeply interconnected engine controlling:  Traceability Analytics Knowing what goes on behind the scenes will help users troubleshoot, optimize, and trust the data Business Central provides.