BW dev system connects to which ECC client?

Hi Gurus,

We are implementing BW in a laggred approach, with ECC developments proceeding little ahead of BW. Now we are in the process of connecting our BW with the testing client of ECC, (so that the data needed by bw is there in ECC testing client). Now since testing is still going on in our ECC testing client its locked for any configuration. But from BW point of view we need the system open for any datasource enhancements.

What is the solution for this?

The diff clients we hav for ECC dev :

client 1 for ABAP developments,

client 2 for Varinat config,

client 3 for testin &

client 4 golden master.

Thanks in advance,

priya.