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();

Transaction ID

Also, in the Analyzer, the transaction log of an xUML service is sorted by transaction ID.

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