3401190 - Your Are Not Able to Create Down Payment Request via Web Service

You are going to create a down payment request via web service, but failed and got error in the log:

"Error in runtime cardinality for BO APCI_CUST_INV_REQUEST, Node ITEM"

SAP Business ByDesign.

You can find the web service error by following steps:

1. Go to the Application and User Management - Web Service Message Monitoring view.
2. You can a lot of errors from ManageDownPaymentCustomerInvoiceRequestIn. 
3. Select one, you can see the error: Error in runtime cardinality for BO APCI_CUST_INV_REQUEST, Node ITEM.

In the request payload, you have maintained the value of tag <BaseBusinessTransactionDocumentID> as 123, However, there is already an invoice request existed in the system with the same ID. 

(123 represents the ID of the value of BaseBusinessTransactionDocumentID)

You need to ensure the <BaseBusinessTransactionDocumentID> value is unique. 

down payment; downpayment; ManageDownPaymentCustomerInvoiceRequestIn; "Error in runtime cardinality for BO APCI_CUST_INV_REQUEST, Node ITEM". , KBA , SRD-CRM-INV , Customer Invoicing , Problem