tranLog
WPS and WESB uses the transaction log, and the tranlog directory contains all the files that hold the record details of transactions that are managed by WAS (which is the underlying transaction manager for WPS). Deleting the transaction logfile can cause inconsistencies in active BPEL processes that participate in a transaction. The case is the same for a development environment also.
See the following link for more information:
http://www-01.ibm.com/support/docview.wss?rs=2307&uid=swg21316028