Updates the on-hand quantity of an equipment inventory item (ItemType = 3) at a specific location. Handles both tracked (DoNotTrackSerialNumbers = false) and non-tracked (DoNotTrackSerialNumbers = true) equipment uniformly: delta is calculated from the EquipmentAsset count at the location, EquipmentAsset and AssetStatusHistory records are created (additions) or decommissioned (deductions), and IILQ is updated to keep both data sources in sync.

POST https://integrationhub.wellsky.io/commands/v4/inventory/equipment/quantity/update-on-hand