BW adapter and Bdoc types

Hi all,

I am new to CRM,we are extracting CRM Services data to BW,but before executing we just checking at RSA3,but it giving some error like infosource/infoobject was not supported.Its true,we have checked in Tcode BWA5 the CRM datasource which we are extracting was not in active.

With few forums we come to knw that datasource can be activated in BWA1,but while if give datasource there to copy its giving like "the datasource say XXXX cant be edited with this transaction".

Can any one tell me what would be the reason for this,with few forums i come to know about bdocs have to be maintained at BW adapter level.

Can any give inputs how would i solve the datasource issue?

Can any one give me information about BW Adapter?

How Bdocs will play a role in extracting CRM datasouces to BWside.

your inputs will be appreciated.

Regards,

Praveena.