Message type: E = Error
Message class:  FI_E - Message Class for FM English Developers 
Message number: 251
Message text: &1
The number of different records  with source fields for which
assignments are being sought exceeds system capabilities.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Reduce the number of  source fields (data on the user interface). For
example, try to limit the input data by entering specific values for
some or all of the source fields. Note that when only the checkbox
relevant to a source field is checked without particular values entered
for that source field, the program considers all  appropriate data for
that field.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FI_E251 typically relates to issues in the Financial Accounting (FI) module, particularly concerning the posting of documents or transactions. The error message itself may indicate that there is a problem with the account assignment or the configuration of the financial document being processed.
Cause: The specific cause of the error message FI_E251 can vary, but common reasons include: Incorrect Account Assignment: The account specified in the transaction may not be valid or may not be set up correctly in the system. Missing Configuration: Certain configurations related to the financial document type, account determination, or other settings may be missing or incorrect. Posting Period Issues: The posting period may be closed or not open for the transaction being processed. Currency Issues: There may be discrepancies in currency settings or exchange rates that are causing the error. Document Type Restrictions: The document type being used may have restrictions that prevent the posting.
Solution: To resolve the FI_E251
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