Create Sequential Numbering in Message Mapping

Question

We are using XI 3.0 with R/3 Enterprise.
I am working on a scenario:
Webapp to xi to R/3 to xi to webapp to xi to R/3.
Basically, users log onto web site, request invoice details from R/3, dispaly invoice in webapp, pay amount and post receipt into R/3!
As we are posting an accounting document we have to pass accross the accounting document number.
I have tried the following to generate a number for the externally assigned number:
Constant: 9800000000 and A Counter starting from one( with increments of one) add together and map into obj_key field on accounting document header.  When I test the mapping, I get the following:
    Debug:Start tag [OBJ_KEY]
    Debug:Put value [9.7999995E9]
    Debug:Close tag [OBJ_KEY]
Is there an easier way to assign a sequential/incremental number into mapping??
Regards.
Barry Neaves

Answer 1

I have implemented a simple function in one of my mappings to generate  sequqnce nos. Modify the code according to your requirement
   //write your code here
GlobalContainer globalContainer;
globalContainer = container.getGlobalContainer();
Integer count;
Object obj =globalContainer.getParameter("Count");
if (obj==null) count =new Integer(0);
else count = (Integer)obj;
count=new Integer(count.intValue()+1);
String szero="";
String str=count.toString();
for(int i=0;i<5-str.length();i++)
     szero=szero.concat("0");
str=szero.concat(str);
globalContainer.setParameter("Count",count);
return str;