Symptom
You are executing transaction code RSA1 and it prompts you below message,
You can only work in client 001
Solution
1. Execute transaction code SE37 and fill in the field with function module RS_MANDT_UNIQUE_SET.
2. On the next page, enter the client number at the i_mandt field. Press save to activate your changes.
3. You can now login to the maintained client and execute back the transaction code RSA1.
Reference
SAP Note 316923.
