Deleting a warehouse from part maintenance V8.00.809d

Can any one tell me if there is a way to delete a warehouse from a
particular part number in the part maintenance form that has had a
transaction?

For instance, Part A has warehouse 1 attached to it. We have now moved
Part A to warehouse 7. We want to delete warehouse 1 from this part but
we cant because there has been transactions here.

Any help will be greatly appreciated.

Cheers,
Jason Abramczyk
Precision Parts