[rules-users] how to use only updated value in drools

[learner]

Please find a basic structure of my drl file 

rule "set b value" 
      salience 10 
    no-loop 
    when 
        e : Person(b == " "); 
    then 
    e.setB("10"); 
end 
  
rule "b other than 10" 
      salience 1 
     no-loop 
     when 
      e : Person(b != "10") 
     then 
       System.out.println("error"+e.getB()); 
end     

The problem is the sysout gets printed in rule 2 , but it should not as the
value of b is modified to 10 in 1st rule

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