SAP Note 23766 - SOP: Create product group: Batch input error 1

Symptom:

Create product groups: Termination with batch input error 1.

Cause and prerequisites

The customer has maintained table T134 incorrectly.

Solution
Table T134 in the standard system contains material type 'ROH' as screen reference for material type 'PROD' (used for product groups). The customer had entered 'PROD' here. Reset the table to the status of the standard system to correct the error.