Hi,
you need to maintain the mapping in your transport target system
e.g
ERP DEV connected to BW DEV
ERP TEST connected to BW TEST
In BW TEST you need a mapping ERP DEV to ERP TEST. See table RSLOGSYSMAP, additional the following link could be useful:
Source System connection tables - SAP NetWeaver Business Warehouse - SCN Wiki --> table RSLOGSYSMAP
best regards,
Janette