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Review the part program and identify the tool group number being called (typically in a T-code or tool change command).

Access the Tool Management screen (MENU > TOOL MANAGEMENT or SYSTEM > TOOL DATA depending on control model) and verify if the called tool group exists.

If the tool group does not exist, create the tool group entry with the correct group number and assign appropriate tools to that group.

Ensure you have proper authorization level to modify tool management data.

Reset the alarm, return to the beginning of the program block, and restart the program to verify the tool group is now recognized.

Check parameter 13240 (Tool Management Enable) to verify tool management is enabled (should be set to 1).

Document current parameter values before making any changes.

Verify parameters 13201-13210 (Tool Group settings) are properly configured for your machine's tool management system.

If parameters appear correct but tool group data is missing, restore tool management data from a known good backup file.

Coordinate with machine operator to schedule downtime for data restoration.

If no backup exists, manually re-enter all tool group definitions based on machine documentation or previous program records.

Examine the program line where the alarm occurs and verify the tool group call format matches the machine's required syntax (e.g., G10 L3 Pxx format).

Compare the program format with a known working program on the same machine to identify syntax differences.

Check if the program was created for a different control model or machine type that uses a different tool management structure.

Correct the program syntax to match the machine's tool management format, or modify the tool group definitions to match the program's expected format.

Test corrected program in single block mode to verify proper operation.