Hello,
Test with setup, in alternate unit of measurement assign 125 EA = 1 BOX,
Check CUNI for BOX it should be already having Decimal pl. rounding = blank or 0
in Plant storage data 1 Unit of issue = BOX
In BOM base Qty 125 EA, component 1 BOX or its multiples...like Base Qty 1000 EA --> comp 8 BOX
It should work for all the calculations.
Regards
Abhishek