P4205 - How to Override the Unit Cost


Dear All,

Currently i have a situation where need to update the unit cost manually for Confirming the Sales Transfer.
Currently the unit cost is get pick up from table F4105 based on Branch plant / Item.

Is there any way that i can set up for Sales Type (ST - Internal Sales Transfer) the unit cost can be updated manually

Or if i need to customize the application (P4205) where the code is written.
I tried to dump the event rules and search for F4105 - couldn't find it.

Appreciate if someone can assist.