Hi All, Can we use getSublistField in suitelet? I am trying to use this API in suitelet to disable particular sublist field but it's not working. Please help.

It looks like that API gets a field on a particular line. Are you trying to disable the field on a given line, or the entire column?

^^ that would be the advice for a user event. if you have a suitelet then you probably are building the form so you’d disable it when you add the field to the sublist

Field on a given line

try a client script instead. but you’ll probably have to mess with the DOM directly to make it happen

That can be done in SS1.0 only.

Ok, any other solution to disable particular sublist field?

I would avoid disabling a field on a given line. It's hacky and can only be done reliably in SS1.0. I would use a client script to validate data entry. So if you want to prevent a user updating fieldY if fieldX === 0 or what have you, you can use a dialog message and prevent them from changing that field.