I work as a dietitian nurse in a kindergarten, where I take samples an...

I work as a dietitian nurse in a kindergarten, where I take samples and create menus. However, for some reason, the storekeeper decided that I should be the one ordering the supplies. Previously, she was the one who placed the orders and also created the menus. I'm new here. Creating the menu is fine, as it's part of my duties, but I'm unsure about placing orders for supplies. I approached the head of the kindergarten about this issue, and she agreed with the storekeeper, saying that I should be the one to order the supplies. 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 shift the responsibility of ordering supplies onto me.