Refer to the Administrator Guide chapter on Configuring Servers and Parameters. Look for the DISABLE_COMMAND_INTERFACE parameter.
Description:
If this parameter is set to “Y” (default), only users belonging to the TDAdmin group can use the OTA Command object
If it is set to “N”, any user can use it.
If it is set to “ALL”, no users can use it.
For more information, refer to the HP ALM Open Test Architecture API Reference.
You have to add the DISABLE_COMMAND_INTERFACE parameter to your Site Configuration and set the value to N to allow users with roles other than TDAdmin to execute workflow code that utilizes the Command object.