Message type: E = Error
Message class:  EA - IDoc Basis Messages 
Message number: 355
Message text: No. of fields in repository structure &1, no. of fields in segment &2
The number of fields in the segment is '&v2&'. In the repository
structure, however, there are '&v1&' fields.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Please compare the segment structure with the appropriate repository
structure of the same name. In the segment editor, change the structure
in accordance with your requirements and save.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message EA355 indicates a mismatch between the number of fields defined in a repository structure and the number of fields in a corresponding segment. This typically occurs in the context of IDoc processing, where the structure of the IDoc does not align with the expected structure defined in the SAP system.
Cause: Mismatch in Structure Definition: The repository structure (which defines the data structure for the IDoc) has a different number of fields compared to the segment definition (which is the actual data being processed). Changes in IDoc Structure: If there have been recent changes to the IDoc structure (e.g., adding or removing fields) without updating the corresponding repository structure, this error can occur. Incorrect IDoc Type: The IDoc type being used may not match the expected structure, leading to discrepancies in field counts. Custom Development: If there are custom segments or modifications in the IDoc processing logic, they may not be
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