BAPI_PRICES_CONDITION - HOW TO CHANGE CONDITION RECORDS

Hi,

Iam using the BAPI -BAPI_PRICES_CONDITION .This creates condition records successfully..but when i try to change that condition record, it is creating one more entry in the condition table(eg a904) as knumh is not a key field in the condition tables.however in konh and konp it is fine.please help urgently.i tried the operation '004' and '005'.

Thanks

Rendeep