[Exim] exim bug? child xxxxx ended: status=0xb

Hi,

Im posting this once again with another subject with hope
that someone will answer;-))

I'd like to autenticate useres from diffrent tables in mysql
depending on the domain.
I tried the following:

fixed_plain:
    driver = plaintext
    public_name = PLAIN
    server_condition =  \
      ${if eq {${extract{2}{@}{$2}}} {this.domain} \
      { \
       ${if crypteq {$3} {${lookup mysql{select .... 
      }{ \
       ${if crypteq {$3} ${lookup mysql{other_select ...
      }}  
    server_set_id = $2

i got from exim (3.:
auth plain AHQjZXhpbTEuZ3Jhei5pbm9kZS5hdABzd3RhY2FkMTQ=
child 16033 ended: status=0xb

if i try this with simple authentfication:

server_condition =  \
     ${if crypteq {$3} {${lookup mysql{select ....

it worked.

any suggestions?
maby a better way to do this?


Robert