I have already trimmed my generated wsdl class by cutting down the wsdl but when my test class written is showing no coverage no green no red its 0% coverage..any ideas.It will be great help 

Thanks

Note : Following is a small development being carried out to demystify salesforce apex webservice and callout features, please correct me if you find my understanding to be incorrect.

I am trying to integrate two Salesforce Orgs using Apex. Apex supports both callouts and webservices, then why not leverage both to achieve a 360 connectivity between two Salesforce instances.

Org1 : Create a Apex Web Service, Generate its WSDL

global class AccountPlan {

webservice String area;
webservice String region;

//Define an object in apex that is exposed in apex web service
global class Plan {
webservice String name;
webservice Integer planNumber;
webservice Date planningPeriod;
webservice Id planId;
}

webservice static Plan createAccountPlan(Plan vPlan) {

//A plan maps to the Account object in salesforce.com.
//So need to map the Plan class object to Account standard object
Account acct = new Account();
acct.Name = vPlan.name;
acct.AccountNumber = String.valueOf(vPlan.planNumber);
insert acct;

vPlan.planId=acct.Id;
return vPlan;
}

}

Org2:  Consume above generated WSDL to generate following Apex Class viz.,AccountPlanClasses

public class AccountPlanClasses {
public class LogInfo {
public String category;
public String level;
private String[] category_type_info = new String[]{'category','http://soap.sforce.com/schemas/class/TCSSAAS/AccountPlan','LogCategory','1','1','false'};
private String[] level_type_info = new String[]{'level','http://soap.sforce.com/schemas/class/TCSSAAS/AccountPlan','LogCategoryLevel','1','1','false'};
private String[] apex_schema_type_info = new String[]{'http://soap.sforce.com/schemas/class/TCSSAAS/AccountPlan','true','false'};
private String[] field_order_type_info = new String[]{'category','level'};
}
public class AllowFieldTruncationHeader_element {
............................
............................

Now lets try to connect to Org1 from Org2

AccountPlanClasses.Plan plan = new AccountPlanClasses.Plan();
plan.name = 'Chirag';
plan.planNumber = 111;
AccountPlanClasses.AccountPlan a = new AccountPlanClasses.AccountPlan();
a.createAccountPlan(plan);

Execution of above code runs into following error

WebService returned a SOAP Fault: INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session faultcode=sf:INVALID_SESSION_ID faultactor= 

I to feel that somewhere I am missing User Credentials to be supplied, but I dont know exactly where. Please guide me to complete this 360 connectivity between two orgs using Apex.