543 wrong qty for consumption

While doing 105 for Subcontracting SA...system is proposing wrong qty for down level item ...for eg in BOM we have maintained 1:1 ratio but for each line item system proposes different qtyies.....

Cant able to get where im missing.....There are no changes in BOM..have checked....for 101 system proposes 16 qty but for 543 downlevel system is proposing 61 qty...

Please suggest