How To Fix AH420 - Schema &1 contains no schema steps

SAP Error Message - Details

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 420

• Message text: Schema &1 contains no schema steps

What causes this issue?

The following factors could have led to this error message:
Schema &V1& contains no schema steps.
The schema key is missing in the rate category or the installation

System Response

Billing of schema is canceled.

How to fix this error?

Insert rate steps in schema &V1& so that the rate layout is complete.
Enter the key for a schema which contains the rates belonging to the
contract.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AH420 - Schema &1 contains no schema steps ?

  The SAP error message AH420, which states "Schema &1 contains no schema steps," typically occurs in the context of payroll processing or time management when the system is unable to find any defined steps in the specified schema. This can lead to issues in payroll calculations or time evaluations.
  Cause:
  
  Empty Schema: The specified schema (indicated by &1) does not have any steps defined. This could happen if the schema was not properly configured or if it was inadvertently deleted or modified.
  Incorrect Schema Assignment: The schema might not be correctly assigned to the relevant payroll area or employee group.
  Transport Issues: If the schema was transported from another system, it might not have been transported correctly, leading to missing steps.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to view or execute the schema, leading to the perception that it is empty.
  
  Solution:
  
  
  Check Schema Configuration:
  
  Go to the transaction code PE01 (Schema Maintenance) and enter the schema name to check if it contains any steps.
  If the schema is empty, you will need to define the necessary steps for payroll processing.
  
  
  
  Review Schema Assignment:
  
  Ensure that the schema is correctly assigned to the relevant payroll area or employee group in the configuration settings.
  Check the configuration in SPRO under the payroll settings to ensure that the schema is linked correctly.
  
  
  
  Transport Check:
  
  If the schema was recently transported, verify that the transport request was successful and that all necessary objects were included.
  You may need to re-transport the schema or manually recreate it if it was lost.
  
  
  
  Authorization Check:
  
  Ensure that the user executing the payroll or time evaluation has the necessary authorizations to access and execute the schema.
  Check the user roles and profiles to confirm that they have the required permissions.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for guidance on configuring payroll schemas and troubleshooting related issues.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  PE01: Schema Maintenance
  PE02: Schema Overview
  SPRO: Customizing Implementation Guide
  
  
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to schema configuration or known bugs.
  Community Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the AH420 error and implement the necessary solutions to resolve it.