Use wfchlut.sql to change the internal name of a lookup type and update all references to the lookup type. See: Change the internal name of a workflow object.

Use the script as follows:

sqlplus <user> @wfchlut <old_lut> <new_lut> 
Enter password: <password>

Replace <old_lut> with the current internal name of the lookup type, and replace <new_lut> with the new internal name of the lookup type.