SAP Message TT166 - You are not allowed to execute in & client & (client table T000)

Diagnosis
You are not allowed to carry out test procedures in the current client.

System Response
When the clients are created for a system, a flag can be set in thetable T000 to indicate whether or not test procedures can be executedin this client.

Procedure
Make sure that you are logged on to the correct client. Have the clientmodified if necessary.