I don’t know what you mean by “can not select the song” but in the screen shot you are displaying, the song. “Skandai im Sperrbezirk” has the default program change number 68 and that is because none of the song parts in that song have been assigned an explicit program change number.
I have three songs and I have not specified any program change numbers for any song part and hence each song gets a default program change number (by the way, understand that in this case, it is the first song part of the song that is tied to that default program change. So if I sent program change number 2 into GP, the “Verse” song part would be selected.
Now, if I double-click on the second song part (say), here called “Intro” and assign an explicit program change number to it, in this case PC 15,
In this example, because more than one song part in the song has explicit assigned PC numbers, there will be an asterisk associated with the song itself to indicate that more than one part has an explicit PC number and then each part displays the actual PC
I think I have found the problem. A few of the songs have fixed numbers the others had the default configuration. if I fixed number over rules the default you receive the “minus”.
I have decided to give all Fixed numbers in the song part. So the numbers Do not change when I’m deleting a song.