If you have adjusted security on a user (removed/added transactions) and want that to reflect in the transaction search you need to do the following steps:
Add an entry to the table SMOFPARSFA
Then under each user you need to set the parameter id CRM_REPORTING_FRAMEWORK to B
For further information please review OSS Note 615670.
This will save you a lot effort when tweaking and testing security roles for business transactions in the CRM webclient.