You use physical inventory tags to record the physical counts of inventory items. Physical inventory tags represent actual hard copy tags that some companies use to count inventory items. A tag contains the count for a group of a given item. Although you can record only one item on a tag, multiple tags can reference the same item, with each tag referring to a unique physical location for an item.

Note: A tag represent a single item number in a particular subinventory, locator with a given revision, lot, and serial number.
If we are not considering serial and lot number then the single TAG might have n number of items (in a particular sub-inventory, locator combinatio)

Oracle Inventory can generate default or blank tags for your physical inventory.

If you choose to generate default tags for each item, specify the starting tag number and the increment by which you want to increase each digit in the tag number. Your tag numbers may be alphanumeric, but you can increment only the numeric portion. The alphabetic characters in the tag number stay constant. Inventory then uses these tag numbers to generate a tag for every unique combination of item number, subinventory, locator,revision, lot, and serial number for which the system has an on–hand quantity not equal to zero.

If you want to have some empty tags handy to record counts for stock–keeping units for which Inventory has no on–hand quantity (and therefore does not generate default tags), you can generate blank tags. Inventory assigns tag numbers to blank tags, but does not include any item or location detail. You specify this information when you enter your tag counts. You can generate as many blank tags as you want.

You can also exclusively use blank tags to perform a physical inventory. If you need to perform a complete wall–to–wall physical inventory, you can go through your warehouse and attach blank tags to every item and/or location you see. As you perform the count, you record the item and stock–keeping unit information along with the actual on–hand quantity.