How To Fix GB301 - Multi-set & is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: GB - Messages used by the Boolean code generator

• Message number: 301

• Message text: Multi-set & is not allowed

What causes this issue?

You have tried to compare a field value with a set which is assigned to
a table which is not assigned to a Boolean class. This set, &V1&, is a
multi set and is therefore may not be used in connection with a field
value.
<ZH>Example</>
,, <BSEG> $HKONT in <CCSS> MULTI_SET

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The entry was refused by the system.

How to fix this error?

Try to use a basic set or a single set. With these types of sets, it
is possible to make comparisons with field values.
<ZH>Example</>
,, <BSEG> $HKONT in <CCSS> SINGLE_SET or
,, <BSEG> $HKONT in <CCSS> BASIC_SET

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GB301 - Multi-set & is not allowed ?

  The SAP error message GB301 ("Multi-set & is not allowed") typically occurs in the context of SAP's data processing, particularly when dealing with multi-set operations in the context of data extraction or reporting. This error indicates that the operation you are trying to perform is not permitted because it involves a multi-set that is not allowed in the current context.
  Causes:
  
  Invalid Data Structure: The data structure you are trying to use may not support multi-set operations.
  Incorrect Configuration: The configuration settings for the data extraction or reporting may not allow for multi-set operations.
  Incompatible Data Types: The data types involved in the operation may not be compatible with multi-set processing.
  Business Logic Restrictions: There may be business rules or logic that restrict the use of multi-sets in certain scenarios.
  
  Solutions:
  
  Review Data Structure: Check the data structure you are working with to ensure it supports multi-set operations. If it does not, consider restructuring your data.
  Adjust Configuration: Look into the configuration settings of the relevant module (e.g., BW, reporting tools) to see if multi-set operations can be enabled or if there are specific settings that need to be adjusted.
  Check Data Types: Ensure that the data types you are using in your operation are compatible with multi-set processing. You may need to convert or adjust the data types.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on multi-set operations and any restrictions that may apply.
  Debugging: If you have access to debugging tools, you can trace the execution to identify where the error is being triggered and understand the context better.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  Documentation: Review the relevant SAP documentation for the module you are working with, as it may provide insights into multi-set operations and their limitations.
  
  By following these steps, you should be able to identify the cause of the GB301 error and implement a suitable solution.