SAP IS-U FICA:Setting Conditional Locks at Line item Level

Hi Experts,

I am searching FM/BAPI for setting conditional locks at line item level.

FMS: FKK_S_LOCK_CREATE and FKK_S_LOCKSET_MAINTAIN tried these two.

These function modules are showing results but not updated actual mode.

when i am checking table DFKKLOCKS, it is not updating.

Please find screen shot.

How to proceed further.

Thanks in advance,

Prasadu Javvadi.