SAP Message WL855 - Date & is not valid (plausibility check not fulfilled)

Diagnosis
The date specified is invalid. It contains:

  • invalid characters (such as letters)

  • an invalid date unit (such as a month greater than 12 or more days than
  • the month contains).

    System Response
    The action was cancelled.

    Procedure
    Enter a valid date. Please observe the validity criteria specifiedabove.