The value of Source System Code attribute is invalid

/fscmRestApi/resources/11.13.18.05/operationTransactions

An error occurred when calling the interface：The value of Source System Code attribute is invalid

Source System Code has been maintained using "Manage Trading Community Source Systems task".

{

"SourceSystemCode" : "HAP",

"SourceSystemType" : "EXTERNAL",

"OperationTransactionDetail":[{

"OrganizationCode":"INV_ZGY",

"TransactionDate":"2023-12-12T19:47:03+08:00",

"TransactionQuantity":50,

"TransactionUnitOfMeasure":"册",

"WoOperationSequenceNumber":10,

"WorkOrderNumber":"LS20231212001_1",

"FromDispatchState":"READY",

"ToDispatchState":"COMPLETE",

"ComplSubinventoryCode":""

}]

}