Oracle Instance Wizard will not allow a new file to be added to an Oracle Tablespace
The Oracle Instance Wizard dialog for modifying the files in a tablespace will not allow any changes, including adding a new file to the tablespace, if Auto Extend is enabled on the file and the next extent would cause the maximum size for a file to be exceeded. Any action on the tool other then disabling Auto Extend causes an informational dialog about the size limit to be displayed. Without disabling Auto Extend, the only thing that can be done on the tool at this point is to use the X in the upper right to exit.Symptoms:
Disable the Auto Extend on the file that has reached the Maxium Size.