I work as a dietitian nurse in a kindergarten, taking samples and crea...

I work as a dietitian nurse in a kindergarten, taking samples and creating menus, but for some reason, the storekeeper decided that I should be the one to order the food. Previously, she was the one who ordered the food and also created the menu, and I am new here. Well, creating the menu is fine, as it is part of my duties, but I am concerned about ordering the food. I approached the head about this, and she agreed with the storekeeper and also said that I should be the one to order the food. For those who have worked as a dietitian nurse in a kindergarten, I would like to know if this is really the case? Maybe the storekeeper decided to push this responsibility onto me.