By pressing the CREATE button (when creating a slot) or SAVE (when editing a slot), the variable name's compliance with the requirements is checked.
If the variable name does not meet the criteria, the slot will not be saved and an error will occur: Wrong name. The name must be no more than 128 characters and may contain only Latin letters, numbers and _ .
Important: Variable names are case sensitive, i.e. {{ var }} and {{ Var }} are different variables