Updating the shipment lines using shipmentLineTransactionRequests

Summary:

Hi,

I am trying to update the shipment using shipmentLineTransactionRequests Rest api.

Payload :

{

 "ActionCode": "UPDATE",

 "DocumentNumber": "160000##1##1991",--getting the detail from Transportation Shipment Line

 "SourceSystemId": 300000000338584,

 "Order": "1991", -- Sales Order number

 "SourceOrder": "1991",-- Sales Order number

 "OrderTypeCode": "SALES_ORDER",

 

 "shipmentLines": [{

  "ScheduledShipDate": "20240328090000"

  

 }]

}

I am getting below error:

"MessageName": "WSH_SHPCN_SR_INVALID_ORD",

  "MessageText": "The request cannot be processed because the sales order or sales order line does not exist.",