Hi Thomas
When you are perform the Homogeneous system copy method, system export / Import you have to do some of the prerequisite steps
1. In you source system(On production system) Suspend all the background jobs by using program BTCTRNS1 from release to suspended all the BG jobs (For releasing the BG jobs once you source system export completed by using the program BTCTRNS2)
2. Lock all transaction user id's
3. Start the Homogeneous system copy source system export process ..
4. At your target system, once the import task completed, it will same like at the time of export status (all the BG jobs are suspended & user id are locked)
You can refer the SAP Note 888210 - NW 7.**: System copy (supplementary note)
BR
SS