How to keep the quant number

Hi,

We are using High Rack with FIFO (type L).

However, when we placed the same article into the existing bin with the same article, it merged into one.

The quantity are summed and the original quant was used.

How can I keep it separate such that I am able to know the existing quantity(original quant no.) and the incoming quantity(new quant no.)

By the way, we are not doing batch management.

Thanks