BEx Documents - transfer to another bi system

Hello,

we've upgraded our bi systems and would nead to transfer BI documents (for info provider) from one bi system to another - is there any possibility?

I tried to manually export and import bi documents, but

1. this can only be done one by one and

2. it doesn't work correctly, as after importing not all key fields are filled correctly

Any ideas?

Thanks a lot,

Doris