Message type: E = Error
Message class:  FI - TR-FM Funds Management 
Message number: 130
Message text: Not purely a down payment transaction
If you are using Funds Management or Project Cash Management, you need
to distinguish between down payment items (special G/L transaction type
"A") and normal expense items (special G/L transaction type " ") when
posting a document.  You are trying to post a document which does not
meet these requirements.
Generate two documents
one document containing the down payment item
and another one containing the expense item.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FI130 "Not purely a down payment transaction" typically occurs in the context of financial accounting when a user attempts to post a transaction that is expected to be a down payment but does not meet the criteria set by the system for such transactions. This error can arise in various scenarios, such as when processing invoices or payments.
Cause: The error can be triggered by several factors, including: Incorrect Document Type: The document type used for the transaction may not be configured to allow down payments. Missing Down Payment Indicator: The transaction may not have the necessary indicators or flags set to classify it as a down payment. Inconsistent Account Assignment: The account assignment may not align with the requirements for down payment transactions. Transaction Type Mismatch: The transaction type being used may not be compatible with down payment processing.
Configuration Issues: There may be issues in the configuration of the financial accounting
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