How To Fix KK691 - Ref. unit of measure & cannot be converted into unit of measure &

SAP Error Message - Details

• Message type: E = Error

• Message class: KK -

• Message number: 691

• Message text: Ref. unit of measure & cannot be converted into unit of measure &

What causes this issue?

The unit of measure of the object being used as a template cannot be
converted into that of the destination object, because there is no
definition in Customizing of how unit of measure &v1& is to be
converted into unit of measure &v2&.

System Response

Since the lot size has not changed, the item quantities are not
adjusted to the lot size. The system merely accepts the predefined lot
size.

How to fix this error?

Go into Customizing and define how units of measure &v1& and &v2& are
to be converted, or check whether you have specified the correct
reference cost estimate.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KK691 - Ref. unit of measure & cannot be converted into unit of measure & ?

  The SAP error message KK691 typically occurs in the context of controlling (CO) when there is an issue with the conversion of units of measure (UoM) in a cost object, such as a cost center or internal order. This error indicates that the reference unit of measure cannot be converted into the target unit of measure.
  Cause:
  
  Incompatible Units of Measure: The reference unit of measure and the target unit of measure are not compatible. For example, trying to convert between units that do not have a defined conversion factor.
  Missing Conversion Factors: There may be no conversion factors defined in the system for the units involved.
  Configuration Issues: The configuration settings for units of measure in the system may not be set up correctly.
  Data Entry Errors: Incorrect data entry in the transaction that triggered the error.
  
  Solution:
  
  
  Check Unit of Measure Settings:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) to check if the conversion factors between the reference and target units of measure are defined.
  Ensure that the units of measure are correctly configured in the system.
  
  
  
  Define Conversion Factors:
  
  If conversion factors are missing, you can define them in the same transaction (CUNI). Make sure to specify the correct reference and target units of measure along with the conversion factor.
  
  
  
  Review Master Data:
  
  Check the master data for the cost object (e.g., cost center, internal order) to ensure that the units of measure are correctly assigned and that there are no discrepancies.
  
  
  
  Data Entry Validation:
  
  Review the data entry that led to the error. Ensure that the correct units of measure are being used and that they are compatible.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for additional guidance on unit of measure conversions and related configuration.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  CUNI: For managing unit of measure conversions.
  CKM3N: For viewing material master data, which may include unit of measure information.
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to unit of measure conversions.
  
  
  Documentation: Review SAP Help Portal for detailed information on controlling and unit of measure settings.
  
  
  By following these steps, you should be able to identify and resolve the cause of the KK691 error in SAP.