Cant create records

[EasternIndustries-IT]

Unable to create a new record in purchase.order or in anything else. I just keep getting errors.
Msg.payload example

[{
    "partner_id": 1, 
    "state":"approved",
    "pricelist_id": 2, 
    "name": "PO00100", 
    "location_id":12, 
    "order_line":[0,"False",{
        "name":"abcd", 
        "date_planned":1/1/2022, 
        "product_id":1,
        "product_qty":20.0, 
        "price_unit":2.0
       }]
    }]