[rules-users] Should lhs pattern be the same for diffrent Rules in a Rule Base?

[Mehak]

Hi
I have a rule using xml.
 <!-- 1st Rules For Field objects-->  
  <rule name="Rule1"> 
 	<lhs>
 		<pattern identifier="outterMap" object-type="HashMap" />
		<pattern identifier="innerMap" object-type="HashMap">
			<from>
				<expression>outterMap.get("fact")</expression>
			</from>
		</pattern>
		<pattern identifier="field" object-type="Filterable">
			<from>
				<expression>innerMap.get("filterable")</expression>
			</from>
		</pattern>    
  <pattern identifier = "document" object-type="Document">
              <from> <expression> field.getDocument();")</expression>
			</from>
		</pattern>    
<eval> document.getIsNormalTask()</eval>
	</lhs>
	<rhs>   
              field.setDefaultOptionality(Boolean.TRUE);  
	 
   	</rhs>
</rule> 


Another Rule is 

<!-- 2 nd Rule for Menu Items-->
	<rule name="Rule2">
		<lhs>
			<pattern identifier="outterMap" object-type="HashMap" />
			<pattern identifier="innerMap" object-type="HashMap">
				<from>
					<expression>outterMap.get("fact")</expression>
				</from>
			</pattern>
			<pattern identifier="editMode" object-type="Boolean">
				<from>
					<expression>innerMap.get("editMode")</expression>
				</from>
			</pattern>
			<pattern identifier="menuItem" object-type="Filterable">
				<from>
					<expression>innerMap.get("filterable")</expression>
				</from>
			</pattern>
<pattern identifier = "document" object-type="Document">
              <from> <expression> menuItem.getDocument();")</expression>
			</from>
		</pattern>    
<eval>editMode==true &amp;&amp; !document.isInDraftStatus()</eval>
	</lhs>
	<rhs>   
              menuItem.setDefaultVisibility((Boolean)true);
	 
   	</rhs>
</rule> 

The total classes that I have are:
Filterable.java
Field.java inherits Filterable (contains Document object)
MenuItem.java inherits Filterable (contains Document object)
Document.java 
I am setting up the filter based on rule name such that
for MenuItems rule executed is : Rule2
For Field objects rule executed is :Rule1
 
The problem is that all the rules are executed for all the objects passed as
facts and statements above <lhs> are matched. As these are diffrent, runtime
error is displayed that error in Rule1, getOptionality for field producing
error.

Basically I want to know should lhs be the same for all the rules in the
Rule Base? And why are all the patterns matched for a given fact in working
memory?

Thanks
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