Unable to create a requisition using rest API

Summary:

Hi,

I am trying to create a requsition using restAPI with the below payload.

{  "RequisitioningBUId" : 3000000XXXXXX,  "PreparerId" : 3000000XXXXX,  "Description" : "Purchase Re NEW",  "InterfaceSourceCode" : "WACS",  "ExternallyManagedFlag" : false,  "lines" : [ {    "LineNumber" : 1,    "LineTypeCode" : "Goods",    "ItemDescription" : "TEST1104",    "ItemId" : "3000000XXXXXX",    "Quantity" : 5,    "CurrencyCode" : "USD",    "UOM" : "each",    "Price" : 50,    "RequesterId" : 3000000XXXXX,    "RequestedDeliveryDate" : "2025-02-21",    "DestinationTypeCode" : "EXPENSE",    "DestinationOrganizationCode" : "1010",    "DeliverToLocationCode" : "Seattle",    "DFF" : [ {      "wacsPrNumC" : "20250000000011",      "wacsPrHdrIdC" : "08262232287443",      "wacsPrLineIdC" : "31203875131119",      "__FLEX_Context" : "WACS"    } ],    "distributions" : [ {      "Quantity" : 5,      "DistributionNumber" : 1,      "ChargeAccount" : "",      "DFF" : [ {        "__FLEX_Context" : "WACS",        "itngSourceSeg" : "WACS"      } ]    } ]  } ]}

However, it is still giving me below errors:

LineNumber 1: You must either enter a valid value or an existing value for the CategoryId attribute. The current value is 3000000XXXXXX. (POR-2010892)

LineNumber 1: You don't have the required privilege to change item details. (POR-2011030)