I have eight repositories and the identifiers for all the repositories are distinct .The identifiers ,these repositories are generating , are based on their IP addresses. So for One repository say , if it has 10 records and it's IP address is 192.168.68.70 , then the identifiers are http://192.168.68.70
biblionumber=1 , http://192.168.68.70
biblionumber=2 ....and so on.
Likewise for other repositories. So what could possibly be other reason ? Though I will have to check if by any chance , same identifiers were generated for a single repository .
thanks and regards,