You want to check how many items have excess inventory.

Open Table, Graph, or Tile Set > Table: Item Exceptions Summary > Filter by Items with Excess Inventory

Manage Plans > Edit Plan Options > Select Supply tab > Navigate to Item area > Filter by Items with Excess Inventory

Open Table, Graph, or Tile Set > Table: Exceptions > Expand Supply Planning Exceptions > Select Items with Excess Inventory

Open Table, Graph, or Tile Set > Table: Items with Exceptions > Filter by Items with Excess Inventory

Open Table, Graph, Tile Set > Table: Items > Select any Item > Drill to: Item Exceptions > Expand Supply Planning Exceptions > Select Items with Excess Inventory > Refresh the search results