BAPI_OBJCL_CHANGE Lock errors

Hi,

I am using this BAPI to assign characteristics in side a sales order loop.

it is working for 1st item, but getting lock error for rest all records(sales items/orders).

How to remove the lock entries, how can we use any enque / deque function modules.

I tried using DESTINATION NONE, but after that COMMIT is not working so records are not updating.

Thanks in advance.

chandra.