Internal ITS, ITS_ERRMSG_EXCEPTION SAPMSYST

Dear Sirs,

I am currently facing an issue with an IAC based on the standard WSTA (some modification to the IAC) program by SAP. It runs quite well, but it looks like out of a 500 user sessions I have got three similar short dumps.

The error message is,

Es wurde eine Fehlermeldung von WebAS empfangen. Fur das Grundbild der Fehlermeldung (Program: "SAPMSYST" Dynpro-Nummer: 40) wurde kein Template gefunden, der ITS service musste deshalb abgebroten worden. Beseitingen Sie nach Möglichkeit die FEhlerursache. Erst wenn die Feherursache beseitigt ist und damit die Fehlermeldun von Web nich mer gesendet wird, ist dieser ITS Service wieder lauffähig.

I know the answer generally is to active ~webdynpro 1 (it is currently 0). However as I understand it this will only make the error appear more sensible. I can not understand why it only happens 1/100 times, could it be something to do with scarce resources?.

Does anyone have any input on where to start looking for the error, what is the normal errors concealed by the error.

I am aware of note 859213 Integrated ITS, error messg on transaction selection screen, however if does not give an answer. We are on the recommended stack/patch level.

best regards,

Jørgen