[Konstantinos]

The second parameter of EditAttachedObject is the index which is integer. listitem is an array (string) and it should've given another warning for tag mismatch.

Assuming you input the slot/index in the dialog:

pawn Код:

EditAttachedObject(playerid, strval(listitem));

You also don't need to use "\" character, it can be in the next line without it (unless it's string) so just use it in one line:

pawn Код:

ShowPlayerDialog(playerid, DIALOG_ATTACH_BONE_SELECTION, DIALOG_STYLE_LIST, "{FF0000}Attachment Modification - Bone Selection", string, "Select", "Cancel");