IsNull (value as Object) as Boolean
|Description:||Returns TRUE if a given field name or value is NULL|
|Supported Context:||FormulaField And BusinessRules|
|value as Object||Represents a specific object field|
|Returned value as Boolean||Returns a boolean value, where "TRUE" indicates that the field specified in the "value" parameter is null|
Set a validation rule for Issues that won't allow the 'Issue State' field to be set to "In Work" if the 'target project' is not defined. To evaluation criteria should be:
IsChanged($State) && ($State = "In Work") && IsNULL($PlannedFor)
Set a project sponsor to be NULL if the 'project type' is marked as internal. Create a workflow rule that will set the following evaluation criteria:
$ProjectType = "Internal"
To update the field within the workflow rule, add an "Update Field" action, select the 'Project Sponsor' field and set it to NULL.