Ni string invalid always

hello, I’m new on xbee develop, so I want help, I’m working on node red generating frames to my app, I can send data over digimesh but I don’t want to use the SH and SL because what happen if the coordinator xbee is damaged? I want to change the configuracion on all devices?
When I try to generate data frames con XCTU no matther what I write always NI String field is on red and tell me “ONE OR MORE API FIELDS ARE NOT CORRECTLY CONFIGURED” SO what I’m doing wrong, I cant generate this frame