The property inputRequiredMsgKey identifies the message that is displayed if the field property inputRequired is set to yes and the user fails to place data into the field.
The message table (the data table that contains the message) is identified in the program property msgTablePrefix. For details on the data-table name, see DataTable part in EGL source format.
The value of inputRequiredMsgKey is a string or literal that matches an entry of the first column in the message table.
If a numeric key is used with a message table that expects a character key, the number is converted to a character string. If a string literal is used with a message table that expects a numeric key, the value in the string must be a signed or unsigned integer.
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