Syntax
aString = getTransactionID()
Semantics

Returns the current transaction ID as a String.

The transaction ID has a maximum length of 40 characters. Longer values are cut by the xUML Runtime.

Examples
set transactionID = getTransactionID();

Using getTransactionID(), you have access to the transaction ID and you can pass it on in your xUML service model.
For information on how to set the transaction ID refer to setTransactionID.