How To Fix C1171 - Enter a class and a class type

C1171 - Overview

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 171

• Message text: Enter a class and a class type

What causes this issue?

A characteristic of data type ADT (abstract data type) must contain
both a class and a class type. At least one of these entries is
missing.

Error message extract from SAP system. Copyright SAP SE.

C1171 - Details

• The SAP error message C1171 ("Enter a class and a class type") typically occurs in the context of classification in SAP, particularly when working with the classification system (e.g., when creating or modifying a material master, equipment, or other objects that utilize classification).
  
  Cause:
  This error message is triggered when the system expects you to enter a class and a class type, but either one or both of these fields are left blank. The classification system in SAP requires that each object is assigned to a specific class (which groups similar objects) and a class type (which defines the characteristics of the class).
  
  Solution:
  To resolve this error, you should:
  
  
  Check Input Fields: Ensure that you have entered both a class and a class type in the relevant fields. 
  
  Class: This is usually a specific identifier for the classification group.
  Class Type: This defines the type of classification (e.g., material, equipment, etc.).
  
  
  
  Use the Correct Class Type: