Category
Use this field to specify the category for the message for an internal application message generated by a
or action.To use expressions to construct the category, click the button to the left of this field.
The contents of this field must use this syntax:
scalarExpr
where scalarExpr is a literal string or resolves to an expression that can be displayed as text.
When you click Event Actions form, the application "wraps"
this content within a CATEGORY( )
parameter, which yields this final syntax:
CATEGORY( scalarExpr )
Note: If scalarExpr is a literal string value, the application automatically encloses it
in double quotation marks when returning it to the Event
Actions form. If scalarExpr is anything else,
the application does not enclose it in quotation marks.