Cycle counts and opportunity counts monitor stock levels. Cycle counting is used on a regular basis to maintain inventory accuracy. After completing the necessary setup, you can conduct cycle counts on the RF.

See here.

Unlike cycle counts, opportunity counts are triggered automatically by stock movements. Certain conditions—for example when stock is picked or transferred from a non-special storage location group—cause the system to check the opportunity count threshold for that item. If this is found to be at or below the level set using the Opp Cnt Threshold field, the system initiates a cycle count. This allows cycle counts to be performed on an on-going basis, reducing the need to do a large cycle count all at once.

See OPC Threshold for details.

Once a cycle count is initiated—either manually using Cycle Count Worksheet Print (3.13) or automatically from an opportunity count—a cycle count frame displays automatically on an RF, prompting the user to whom that transaction has been assigned to count the level of stock remaining in that location.

If stock is unavailable and a user must confirm a picking task with a lower quantity, you can specify that the system prompt to enter a pick fail, then prompt to conduct a count.