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Logging off SAP

We are using VB to communicate with SAP throughout DCOM Connector. I was following the VB example to set up the Session object and logon to SAP. In the examples, there is no logoff method. I need to set the Session Object to logoff from SAP. However, this sometimes does not log off properly. We found that sometimes we get a error log in the system log(SM21). The log is as following:
R49 Communication Error, CPIC return code 020, SAP return code 233
R5A, Conversation ID: 99860671
R64 CPI-C Function: CMSEND(SAP)
And in SM04, sometimes the user remains there for a long time.

Here is the VB code that I am using to logon and end the program.
Set objQuoteSession = CreateObject("SAP.QuoteCreationSession")
objQuoteSession.PutSessionInfo strServerName, UserName, Password, Language, Client
Boo = objQuoteSession.Logon(strError)
Set objQuotation = objQuoteSession.CreateInstance("CAN.Quote")
Set objQuotation = Nothing
Set objQuoteSession = Nothing

Could you tell me what I did wrong? Is there a proper way to logoff from SAP?

Your code looks correct to me. Please report this as a possible bug to SAP.

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