■ The rules of naming an ISAM object (such as a table, column,
  or index) are different from the rules for naming a Visual
  Basic object (such as a variable or procedure). For example,
  ISAM names:
 
  • Have no more than 30 characters.
 
  • Use only the characters A-Z, a-z, and 0-9.
 
  • Begin with an alphabetic character.
 
■ Possible solution:
 
  • Verify that your ISAM object adheres to the ISAM
    naming conventions defined above and change the
    reference as required.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.