It is a true statement that if the input message is omitted while creating a data validation rule for a cell, no message will show when the user selects the cell.
A data validation rule is a process through which a user is restricted to input incorrect or invalid values cells. With the data validation rule, the user is prompted to enter a valid value in a selected cell. Since a data validation rule defines the type of data value that can be entered into a cell; the input message is an optional property that enables to provide with a custom message to appear to the user when the cell is selected. In case when an input message is not specified while creating a data validation rule for the cell, no message will appear when the user selects that cell.
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