V12 UOM Conversion Error Urgent

As per the title, there’s an error with the UOM conversion factor. I have gone through the tutorial here: Purchasing in Different UoM which doesn’t work.

To give a little context, I am stocking “Alcohol-1” in UOM for stock purpose and BOM use.
Default UOM: Kg
Purchase UOM: Drum
Conversion Factor: Drum @ 160

Picture below shows the Conversion Factor for Alcohol-1

Picture below shows that I am buying in “Drum” UOM.

Picture below shows the error. Instead of requesting for 1x serial no, it requested me 160x serial nos which is totally incorrect.