Erase all unprotected fields (ISSUE ERASEAUP)

The ISSUE ERASEAUP command is used to erase all unprotected fields of a 3270 buffer.

It achieves this using the following actions:
  1. All unprotected fields are cleared to nulls (X'00').
  2. The modified data tags (MDTs) in each unprotected field are reset to zero.
  3. The cursor is positioned to the first unprotected field.
  4. The keyboard is restored.

The WAIT option of the ISSUE ERASEAUP command ensures that the operation has been completed before control is returned to the application program.