How do you correct the PO number associated with an asset?

We have an asset that was somehow assigned the wrong PO number.  This asset is old and came over in our conversion to fixed assets 2 years ago, so it was probably wrong in the old system.  We'd like to correct it. It isn't editable on the form, however.   Since it can't be changed there what would be the recommended course of action?   Should a new asset be created to replace it and the old asset record deleted?