When I try to add new line and

selectLine()

it returns an error that

SSS_INVALID_SUBLIST_OPERATION

This is because that line is not exist. If I use

selectNewLine()

it works. But I can't use this because I have already existing lines. Is there any method that I can check if that line is new line or not by linekey please?

You can use selectNewLine when there are other lines that already exist, I don't understand the problem.

@Sandii the first column is SELECT field and when that field is changed I want to change 2nd column in sublist It will add new line if I use

selectNewLine()

share the code