How To Fix 37055 - Unable to insert line in loop

SAP Error Message - Details

• Message type: E = Error

• Message class: 37 - Screen Painter

• Message number: 055

• Message text: Unable to insert line in loop

What causes this issue?

You cannot insert a line within a loop because this would change the
structure of the loop block.

How to fix this error?

To insert a line, dissolve the loop first, insert the line, and then
regenerate the loop.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 37055 - Unable to insert line in loop ?

  The SAP error message "37055 Unable to insert line in loop" typically occurs in the context of SAP's ABAP programming environment, particularly when dealing with internal tables or loops. This error indicates that there is an issue with inserting a line into an internal table while iterating through it, often due to constraints or conditions that are not being met.
  Causes:
  
  Table Locking: The internal table may be locked by another process, preventing the insertion of new lines.
  Invalid Index: The index being used to insert the line may be out of bounds or invalid.
  Looping Issues: If you are trying to modify the same internal table that you are currently looping through, it can lead to inconsistencies.
  Data Type Mismatch: The data being inserted may not match the structure of the internal table.
  Memory Issues: Insufficient memory or exceeding the limits of the internal table can also cause this error.
  
  Solutions:
  
  Check for Locks: Ensure that the internal table is not locked by another transaction or process. You can use transaction codes like SM12 to check for locks.
  Use a Temporary Table: Instead of modifying the internal table while looping through it, consider using a temporary table to store the new entries and then append them after the loop.
  Validate Indexes: Ensure that any indexes used for insertion are valid and within the bounds of the internal table.
  Data Type Consistency: Verify that the data being inserted matches the structure of the internal table. Use the correct data types and ensure that all required fields are populated.
  Debugging: Use the ABAP debugger to step through the code and identify the exact point of failure. This can help you understand the state of the internal table and the data being processed.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on internal tables and their manipulation.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: Engage with SAP community forums or platforms like SAP Community, Stack Overflow, or SAP Answers for insights from other developers who may have encountered similar issues.
  
  By addressing the potential causes and implementing the suggested solutions, you should be able to resolve the "37055 Unable to insert line in loop" error in your SAP environment.