Thanks Jurguen, my answers in blue.
Did you customize residence times for all document types that are in use? Yes, for all document types and positions
Had you ever archived POs before? Yes,but in other system and I had not issues.
what release you are running? SAP APPL 603 0009 Support Package SAPKH60309 Logistics and accounting
In the ERP system the archiving programs are usually the reports RM06EV70, RM06EW70 and RM06ED70, but I can see that your are ending with 47. Yes, archiving programs ending with 47.
Have you taken care that you have the most recent OSS notes for MM_EKKO implemented? No yet, but I'm going to check.