Middleware - external no.ranges on both systems

Hi Everyone,

Is it possible to replicate business partners where both receiving and sender systems have external number ranges ?

The requirement is considering the fact that the ECC Production system already maintains an external number range for existing customers - ones who need to be downloaded to CRM (initial load); as far as I know, the sender system has to have an internal number range and the receiving an external range or else it wont work. I tried external ranges on both sides but replication didnt take place. Please help me

Second question: should changes in replicated BP's in either of the two systems be automatically synchronised in the other system ? because in my case changes in the CRM system are auto. transferred while changes in R/3 are not.

Deserving points to be rewarded.

Best Regards,

Jacob.