Powermail update Tabelle in eigener Extension

Hello, I've a little problem and I am pretty sure here is an expert who can help me easy with this 🙂 Using TYPO3 4.5 and Powermail 1.6 both not changable

With Powermail I want to update a table of my own extension. for this I've written the following code in TS:

plugin.tx_powermail_pi1 {
  
  clear.session = 1
  dbentry {
    tx_frcoursebooking_domain_model_cbdates{
      _enable = TEXT
      _enable.value = 1
      
      _ifUnique.uid = update
      
      uid = TEXT
      uid.data = TSFE:fe_user|sesData|powermail_488|uid11
      
      booked = TEXT
      booked.data = TSFE:fe_user|sesData|powermail_488|uid9
    
    }      
  }
}

488 and the fielduid's are correct, also the tablenames.

Sadly it is writing nothing to the database. powermail debug shows me all session data. The last point of the debug is weird:

"Main Table EMPTY! MM Table no values or entry already exists"

But the entry exists also the table. In the manual and the Internet (which is as fast as hell here) doesnt help me anymore after 3 hours exploring google. PLEASE help.