How to debug Transaction Launcher

Hi Experts,
I am new to CRM. I am working on the requiremnet of calling VA01 screen inCRM WEBUI through Transaction Launcher .
As part of it i copied TSTC BOR object to Z and added some extra method to get some default values populated in VA01 screen.
I tested this Z BOR object and it is working fine. Now in CRM configured Transaction Launcher through wizard and given my logical system (connecting to ecc)and Z BOR object and passed parameter value as VA01 to object key in wizard. created my own logical link id with assigned transaction link id and assigned to workcenter->navbarprofile->businessrole.
I followed this blog to configure Transaction Launcher
/people/vikash.krishna/blog/2008/09/23/crm-2007-how-to--2-a-transaction-launcher
After completion of above development i executed webui but i am unable to display VA01..Intially it used to show ECC screen and message as ' you do not have authorization for transaction VA01'.But when i rectified some thing and again execute webui it is now showing blank screen.
I am unable to make it out where i went wrong whether the problem is with logical system or ZBOR object. WhenI tried to debug it by keeping break-point in the class CL_UICMP_LT_ABOXEXECUTION_IMPL and method ip_inbound plug and in the ZBOR object in ECC i am able to see the parameters passed to the traunsaction launcher class but it is not stoping at ZBOR object .
From last 3 days i am trying hard and unsuccessfull.my deadlines are approching.
Please kindly help me out how can i analyze to see where i went exactly wrong.
I really appreciate the persons who helps me in passing the situation.
Regards ,
Pavan T.

Hi Luis Rivera ,
Thanks a Ton. The link id 'Every thing about Transaction Launcher' is really helpfull.Now i am able to display VA01 in Webui .
My Requirement goes like this
User will search for a account say of function 'Sold-to-party' ,after successfull search we will get related partners also.Now user will select one among the related partners(say 'Ship-to-party') and clicks confirm ,Now we will have two confirmed partners sold-to & ship-to.User will now select create order from Navigation bar and VA01 screen should be displayed with sold-to & ship-to fields get filled automatically from conformed partners.
So i created a ZBOR and added a method with those parameters as import parameters . see the below code.
SWC_GET_ELEMENT CONTAINER 'PCODE'      LV_PCODE.
SWC_GET_ELEMENT CONTAINER 'BUYER'      LV_BUYER.
SWC_GET_ELEMENT CONTAINER 'SHIP_TO'    LV_SHIP_TO.
SWC_GET_ELEMENT CONTAINER 'SOLD_TO'    LV_SOLD_TO.
SWC_GET_ELEMENT CONTAINER 'ORDER_TYPE' LV_ORDER_TYPE.
IF LV_PCODE IS NOT INITIAL.
    SET PARAMETER ID: LV_PCODE-pid FIELD LV_PCODE-value.
ENDIF.
IF LV_BUYER IS NOT INITIAL.
    SET PARAMETER ID: LV_BUYER-pid FIELD LV_BUYER-value.
    ENDIF.
IF LV_SHIP_TO IS NOT INITIAL.
    SET PARAMETER ID: LV_SHIP_TO-pid FIELD LV_SHIP_TO-value.
ENDIF.
IF LV_SOLD_TO IS NOT INITIAL.
    SET PARAMETER ID: LV_SOLD_TO-PID FIELD LV_SOLD_TO-VALUE.
ENDIF.
IF LV_ORDER_TYPE IS NOT INITIAL.
    SET PARAMETER ID 'AAT' FIELD LV_ORDER_TYPE-VALUE.
ENDIF.
CALL TRANSACTION OBJECT-KEY-CODE.
I am able to read the values from BOL to my ZBOR parameters
PCODE, SHIP_TO,SOLD_TO,BUYER e.t.c .Now i want set these values to VA01 screen using SET/GET Parameter ID's as shown in above code.but these values are not being set.Could you suggest any way how can i achieve this.
Thanks in Advance.
Regards,
Pavan.
Edited by: Pavan T on Aug 10, 2011 4:26 PM

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