How To Fix QS081 - The class char. and the master inspection char. are not compatible

SAP Error Message - Details

• Message type: E = Error

• Message class: QS - QM: Master data

• Message number: 081

• Message text: The class char. and the master inspection char. are not compatible

What causes this issue?

You want to assign a class characteristic to the master inspection
characteristic after the master inspection characteristic was created.
The two characteristics, however, are not compatible.
The prerequisites that must be fulfilled in order to assign a class
characteristic depends on whether the class characteristic is of the
data type "<ZH>NUM</>" or "<ZH>CHAR</>."
If the general characteristic is of the data type "<ZH>NUM</>," the
following conditions must be fulfilled:
The master inspection characteristic must be <ZH>quantitative</>.
The two characteristics must have identical units of measurement, if a
unit is assigned to the class characteristic.
The control indicator for the upper specification limit and the control
indicator for the lower specification limit must be set in the master
inspection characteristic.
The interval limits for the class characteristic must be maintained as
follows:

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

<ZH>Master insp. characteristic</> <ZH>Class characteristic
</>
--------------------------------------------------------------------
Lower spec. limit only lower limit, no upper limit
Upper spec. limit only upper limit, no lower limit
Both specification limits both upper and lower limit
If the class characteristic is of the type "<ZH>CHAR</>," the following
conditions must be fulfilled:
A selected set from catalog type 1 was assigned to the class
characteristic.
The master inspection characteristic is <ZH>qualitative</>.
The "Characteristic attribute" indicator is set for the master
inspection characteristic.

System Response

How to fix this error?

Enter a class characteristic that is compatible with the master
inspection characteristic.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message QS081 - The class char. and the master inspection char. are not compatible ?

  The SAP error message QS081 indicates that there is a compatibility issue between the class characteristics and the master inspection characteristics in the Quality Management (QM) module. This error typically arises when you are trying to assign a master inspection characteristic (MIC) to a class characteristic that does not match in terms of data type or other attributes.
  Cause:
  
  Data Type Mismatch: The data type of the class characteristic does not match the data type of the master inspection characteristic. For example, if the class characteristic is defined as a numeric type and the MIC is defined as a character type, this error will occur.
  Incompatible Characteristics: The characteristics may have different units of measure or other attributes that make them incompatible.
  Configuration Issues: There may be issues in the configuration of the characteristics in the Quality Management module, such as incorrect settings in the characteristic classes or master data.
  
  Solution:
  
  Check Data Types: Verify the data types of both the class characteristic and the master inspection characteristic. Ensure that they are compatible (e.g., both should be numeric, character, etc.).
  Review Characteristic Settings: Go to the configuration settings for both the class characteristic and the master inspection characteristic. Ensure that they have compatible attributes, such as units of measure and other relevant settings.
  Adjust Characteristics: If necessary, modify the characteristics to ensure compatibility. This may involve changing the data type or other attributes of either the class characteristic or the master inspection characteristic.
  Reassign Characteristics: If you have made changes, try reassigning the master inspection characteristic to the class characteristic again to see if the error persists.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on configuring characteristics in the QM module.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes such as CL02 (Change Class) or QCC1 (Create Master Inspection Characteristic) to review and modify characteristics.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error.
  Quality Management Configuration: Familiarize yourself with the configuration settings in the Quality Management module, particularly those related to characteristics and classes.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a consultant who specializes in SAP QM for further assistance.