Ok. In this case my question upgrades to a new one 
You told me (in other post, http://scn.sap.com/thread/3392841) that transactionid range is 1 to 10^19
I have a transaction that uses transactionid value as input and convert it in other values.
This transaction has tu use the transactionid as number, integer number (I don't need float version)
My question is: which kind of input must be set to the input variable?
Actually I'm using string and I convert back to a number inside the transaction. I'm sure that it is not the best way, but it is the only one that I found.
With integer and long i will receive an exception when transactionid will become too big.
Then the question is: which is the data type to be used for transactionid parameter?
Thanks
Regards
Fabio