R3AC1- Object Bus_Trans_Msg source and target sites missing

Hi,

In the Txn code: R3AC1 for the object Bus_Trans_Msg we need to enter the source- CRM and target site-R/3 under the tab Initial flow settings which is not editable.

when we do initial download of this object in txn:R3AS if throws an error.

Please let me know how we can enter the source and target site for the object-bus_trans_msg .

Regards

Prathiba