Problem updating items

Problem updating items

Hi,
I'm synchronizing from other platform all the items.

When  I try to update an existing item  calling to  https://books.zoho.com/api/v3/items/{{item_id}}?organization_id={{ORGANIZATION_ID}}  some of them are giving me the next error: {"code":4,"message":"Invalid value passed for bulk_update"}

Can you tell me please where can be the problem? Down is the json of the ones that fail.

{
"name": "4 unidades rollup 85 x 200 alta calidad .",
"rate": "181.64",
"description": "",
"product_type": "goods"
}

{
"name": "Lona recambio rollup 2x2",
"rate": "72",
"description": "",
"product_type": "goods"
}

{
"name": "gastos envío urgente lona 240 x 240",
"rate": "15",
"description": "",
"product_type": "goods"
}

{
"name": "ROLL UP 200  X 200 ALTA CALIDAD impresión, estructura y bolsa de transporte",
"rate": "236.50",
"description": "",
"product_type": "goods"
}