Item Cost - How to set the Resource, Outside Processing, Overhead from 0$ to Null

Hello Gurus,

we just migrated from 11i to Oracle R12.1.3, and we have about 50 items where we have undesired cost_element_id (3,4,5) Resource, Ourside Processing and Overhead set to 0$.

Each time you do any type of these transactions (WIP Completion, WIP Issue, Misc Receipt, etc) these 0$ are always showing in the mtl_transaction_accounts.

Is there a way to update these cost_element_ID so that it can be change from 0$ to Null, like it is for 99% of all other items and like it was on Oracle 11i.

See attached screen shot.

Thanks a lot

Regards

Philip