A short comment. For the Null text which is the text displayed if the intelligent text could not be taken, the Ntext attrbiute is responsible.
When you create a shee and view there are several Layers automatically created. Laye has mentioned Ntext attrbiute.
Then if you check for PDMSDFLTS folder you can find a dra-gen-lablay file. This is the file which stored some defaults used on label layers creation. So if you put there a command
Ntext '#NAMN'
then all layers will have Ntext set to '#NAMN' and that means that if you label something and I-text you put could not be calculated then the system will take value from Ntext so #NAMN