Changing an Item Cost after it has been sold

Hello there,

I am a new RMS user and thanks to this group I am starting to get good at using it.

There's something I couldn't find and couldn't figure out... How can you change the cost of an item that has already been sold?

I would like to be able to go thru the costs report at the end of the day and correct mistakes. Let's say I discover an item that cost me $4 but it shows a cost of $0 in the report because we failed to include a cost when creating the item.

How can I have the report show the updated cost after I change it in the item detail so at the end I have an accurate profit margin figure at the end of the day.

Any help is greatly appreciated.

Thanks,

David