Message type: E = Error
Message class:  FINCS_MD_FSITEM - Consolidation Financial Statement Item Master Data 
Message number: 059
Message text: Start of assignment period must be between 001 and &1.
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The SAP error message FINCS_MD_FSITEM059 indicates that there is an issue with the assignment period specified in a financial document or transaction. Specifically, the error states that the "Start of assignment period must be between 001 and &1," where &1 represents the maximum allowable period defined in the system.
Cause: This error typically occurs due to one of the following reasons: Invalid Period Specification: The start period you are trying to assign is outside the valid range defined in the system. For example, if the valid periods are from 001 to 012 (for a 12-month fiscal year), and you are trying to assign a period like 013, this error will be triggered.
Configuration Issues: The fiscal year variant or the period settings in the configuration may not be set up correctly, leading to discrepancies in the expected periods. Data Entry Errors: There may be a simple data entry mistake where the user has entered an
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