How To Fix WP502 - Syntax error in IDoc &: segment & not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 502

• Message text: Syntax error in IDoc &: segment & not allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WP502 - Syntax error in IDoc &: segment & not allowed ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WP502 Syntax error in IDoc &: segment & not allowed
  
  Cause:
  This error occurs during IDoc processing when the IDoc contains a segment that is not allowed or not expected at the current position according to the IDoc type and message type definition.
  
  The segment in question is either:
  
  Not defined in the IDoc structure for the given message type.
  Placed in an incorrect sequence or hierarchy.
  The IDoc is corrupted or incorrectly generated.
  
  
  This can happen if the sending system or middleware sends an IDoc with an invalid segment or if the IDoc type or message type configuration in SAP is inconsistent with the actual IDoc data.
  
  
  Explanation:
  
  IDocs have a strict hierarchical structure defined by the IDoc type (basic type) and message type.
  Each segment is allowed only in certain positions.
  If a segment appears where it is not allowed, the syntax check during inbound processing fails with this error.
  
  
  Solution:
  
  
  Check the IDoc structure:
  
  Verify the IDoc basic type and message type.
  Use transaction WE30 to display the IDoc type and check the segment hierarchy.
  Confirm that the segment mentioned in the error is part of the IDoc type and allowed at the position it appears.
  
  
  
  Check the inbound processing:
  
  Use transaction WE19 to test IDoc inbound processing.
  Try to simulate the IDoc processing with the problematic IDoc data.
  
  
  
  Check the sending system or middleware:
  
  Ensure that the system generating the IDoc is sending the correct segments.
  If middleware is involved (e.g., PI/PO, CPI), check the mapping and transformation logic.
  
  
  
  Check for custom segments or extensions:
  
  If custom segments are used, ensure they are properly defined and included in the IDoc type extension.
  Use transaction WE31 to check segment definitions.
  Use transaction WE30 to check extensions.
  
  
  
  Re-generate or correct the IDoc:
  
  If the IDoc is corrupted, regenerate it or correct the data.
  
  
  
  Check SAP Notes:
  
  Search for SAP Notes related to WP502 or IDoc syntax errors for your specific SAP version.
  
  
  
  
  Related Transactions and Tools:
  
  WE02 / WE05 – Display IDocs and analyze errors.
  WE19 – Test tool for IDoc inbound processing.
  WE30 – IDoc type development and display.
  WE31 – Segment definition.
  WE20 – Partner profiles (check message type and IDoc type assignments).
  BD87 – Reprocess IDocs.
  
  
  Summary:
  
  Cause: Segment not allowed at the position in the IDoc structure.
  Solution: Verify IDoc type and segment hierarchy, correct the IDoc data or configuration, check sending system and middleware, and test with WE19.
  
  
  If you provide the exact segment name and IDoc type/message type, I can help you with more specific guidance.