When going to accept quest id 1599 at level 4 warlock "Beginning", Guidelime lists a prereq when there is none.

["sort"] = "Warlock";
["classes"] = {
[1] = "Warlock";
};
["deliver"] = {
[1] = {
["id"] = 460;
["type"] = "npc";
};
};
["faction"] = "Alliance";
["name"] = "Beginnings";
["level"] = 4;
["source"] = {
[1] = {
["id"] = 460;
["type"] = "npc";
};
};
["req"] = 1;

Located in Guidelime_QuestsDB.lua

There is no pre-req for this quest. ["req"] = 1 means the level required for accepting the quest.