when do the wip Completion transaction,the lot controlled component quantity is upto 6 decimals

1、during WIP return transactions through interface:

One or more transactions failed for this group of records

The code did not cope with Backflush of lot controlled components having quantity upto 6 decimals

2、when manually do the wip Completion transaction，the lot controlled component shows the "the transaction quantity does not match the lot quantity"，I need modify the quantity to 6 decimals to complete the action