Interclass Conversion causing miscalculation

Summary:

Client is looking for a solution for the below issue
---- They have an item with PUOM as CT (carton)
---- Since they sell this item in PKT they are maintaining an Interclass conversion between CT and PKT as follows

1 PKT = 0.16667 CT (since PUOM is the To Unit)

As a result of this, when order is logged in carton and an integer quantity is put as Order Qty (e.g. 1 CTN qty) it gives 5.99999998 PKT quantity. This is causing miscalculations downstream

INV_QUANTITY_DECIMAL_PRECISION is set as 5 at Site Level

If anyone has encountered this issue and has had a solution to the same