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Apex redirect controller and picklist value not rendering in the form

Hi dreamteam,
I have made a redirection page for a related object on the account page, also available on opportunity page.
The account name is populating fine in both objects, but not my other picklists Business_group and Business_unit, the values are not showing in the form. However I see these values in the url of this new page...

My Apex Controller :

public without sharing class FTSRedirectController{

    public final Field_Technical_Service__c fts;
    public Opportunity opp              {get;set;}
    public Account acc                  {get;set;}
    public String currencyCode          {get;set;}
    public String accId                 {get;set;}    
    public String defaultBusinessGroup  {get;set;}
    public String defaultBusinessUnit   {get;set;}

 public FTSRedirectController(ApexPages.StandardController stdController){
     //get the current record
        user u = [SELECT Business_Group__c, Business_Unit__c, User_Division__c, User_Subdivision__c 
                  FROM User 
                  WHERE Id = :UserInfo.getUserId()];       
         // If a new Fts is opened from an Oppty:
         if(fts.Action_Name__c != null) {  
         opp = [
                    SELECT Id,Business_Group__c,Business_Unit__c, Manufacturing_plant__c, Sector__c, Vertical__c, Sub_Vertical__c, Expected_Sales_Revenue__c, CurrencyIsoCode, Account.Name, Expected_Units_Annually__c, AccountId
                    FROM Opportunity
                    WHERE Id = :fts.Action_Name__c
            //set the values :
            accId = opp.Account.Name;            
            currencyCode = opp.CurrencyIsoCode;                                
            defaultBusinessGroup = opp.Business_Group__c;
            defaultBusinessUnit = opp.Business_Unit__c;                 
        system.debug('oppty : defaultBusinessUnit :'+defaultBusinessUnit+'defaultBusinessgroup:'+defaultBusinessGroup);
        // If a new Fts form is opened from an account:
        if(fts.Account_Name__c != null) {
            acc = [
                    SELECT Id,Business_group__c, Business_unit__c, name
                    FROM Account
                    WHERE Id = :fts.Account_Name__c or Id = :accId
             //set the values :
            accId = acc.Name;
            defaultBusinessGroup = acc.Business_Group__c;
            defaultBusinessUnit = acc.Business_Unit__c;
  public PageReference redirect()
      String str='';
      str='/a4l/e?retURL=%2F001%2Fo&cancelURL=%2F001%2Fo&nooverride=1&CF00Nw0000006nT2m=='+accId+'&CF00Nw0000006nT2s=='+defaultBusinessGroup+'&CF00Nw0000006nT2t=='+defaultBusinessUnit+'&CF00Nw0000006nT2m=='+opp.id ;
     PageReference r= new PageReference(str);

        return r;
My url :

Do you Know if there is something special for picklist fields values?
Thank you,