Source system is Inactive in BW

Hello Experts,

I have this issue when I checked my Process chains which failed at IP level.When I tried checking the cause the message says source system is inactive.

I checked the connection soource system tab. I got the error message for Source system check.

Source system   ERCXXXX is inactive.

BI is unknown in source system.

BI Idoc system ZSBA002 is not is not same as source system IDOC type.

I tried to activate the client from BW this time I have error mesages.

BI is unknown in source system.

BI Idoc system ZSBA002 is not is not same as source system IDOC type.

I checked all the posts in forums.but could not get helpfull ans. Hence posting this.

The connection worked fine earlier

Thanks,

Santhosh.