What must be done if the gains from inventory exceed allowable limits?

When gains from inventory exceed allowable limits, initiating causative research and investigation is essential to determine why this deviation has occurred. This step is critical because it helps identify any underlying issues or discrepancies that may be affecting inventory accuracy. Investigating the cause of the surplus ensures that the situation is understood and appropriately addressed, preventing potential future losses, inaccuracies, or mismanagement.

Identifying the root cause can lead to corrective actions that might involve adjusting inventory practices, retraining staff, or improving monitoring systems. Without this investigation, the organization runs the risk of neglecting potential fraud, theft, or systemic errors that could lead to even larger problems down the line.

The other options do not address the need for thorough understanding and resolution of unexpected inventory changes, which is why they are less suitable in this scenario.