How To Fix 37758 - Fixed step loops not allowed next to variable ones (step loop not moved)

SAP Error Message - Details

• Message type: E = Error

• Message class: 37 - Screen Painter

• Message number: 758

• Message text: Fixed step loops not allowed next to variable ones (step loop not moved)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 37758 - Fixed step loops not allowed next to variable ones (step loop not moved) ?

  The SAP error message "37758 Fixed step loops not allowed next to variable ones (step loop not moved)" typically occurs in ABAP programming when there is an issue with the structure of nested loops in your code. This error indicates that you have a fixed step loop (using LOOP AT ... INTO) that is adjacent to a variable step loop (using LOOP AT ... INTO ... WITH CONTROL), which is not allowed in ABAP.
  Cause:
  
  Mixed Loop Types: The error arises when you have a fixed step loop immediately followed by a variable step loop without any separation or proper structure.
  Incorrect Loop Nesting: The ABAP runtime environment does not allow a fixed step loop to be directly adjacent to a variable step loop because it can lead to ambiguity in how the loops are processed.
  
  Solution:
  To resolve this error, you need to ensure that your loops are structured correctly. Here are some steps you can take:
  
  
  Separate the Loops: Ensure that there is no direct adjacency between a fixed step loop and a variable step loop. You can do this by adding a ENDLOOP statement to properly close the first loop before starting the next one.
  LOOP AT it_fixed INTO wa_fixed.
    " Processing for fixed step loop
  ENDLOOP.
  
  LOOP AT it_variable INTO wa_variable WITH CONTROL control_variable.
    " Processing for variable step loop
  ENDLOOP.
  
  
  Reorganize Your Code: If the loops are logically related, consider reorganizing your code to avoid the error. You might need to rethink the logic to ensure that the loops are not directly adjacent.
  
  
  Use Intermediate Variables: If necessary, you can use intermediate variables or tables to store results from the first loop before starting the second loop.
  
  
  Related Information:
  
  ABAP Loop Types: Understand the difference between fixed and variable step loops in ABAP. Fixed step loops iterate over a table without any control structure, while variable step loops allow for more complex control over the iteration.
  Debugging: Use the ABAP debugger to step through your code and identify where the loops are defined and how they interact with each other.
  Documentation: Refer to the official SAP documentation for more details on loop constructs and best practices in ABAP programming.
  
  By following these guidelines, you should be able to resolve the error and ensure that your ABAP code runs smoothly.