Where is this at in ProSeries Professional? I assume on the asset entry page itself, but creates an error when trying to alter the original cost. Also,is NBV, the net basis value?

These are a couple of options:
1) Delete the Asset Entry Worksheet.  You are not depreciating anything, so there is no need for it.  Just make a note of the information for whenever it is sold.
2) Change the "prior depreciation" to the amount of the Basis, thereby changing the Net Basis Value to $0 and giving $0 depreciation.  Again, make note of the ACTUAL prior depreciation for whenever the property is sold.

Very helpful! Thank you!