Restricting excess raw material consumption ducring confirmation

Dear Experts

Scenario

The production of the finished product comprises of many raw materials. The goods issue is done by backflushing. After few days , it is noticed that some of the raw materials consumed are a bit more and some are less .

The Plant manager insists that this needs to be restricted . Please advise how do we restrict this phenomenon . Your guidance will be highly appreciated . Thanks

Kind regards

Aman