We have a strange problem. We have created some custom MailMerge Call to enable MailMerge with entity context out of a button on a datagrid showing attachments in 7.5.4.

The User pushes the button, is creating a MailMerge document and clicks on "Save & Close". The document gets uploaded to SLX and is shown after a refresh in the mentioned datagrid.

After doing this twice after the third time pressing "Save & Close" the Windows Account appears to be locked (it has to be unlocked) and the attachment wasn't uploaded to the system.

New today: After some problems with that MailMerge (Attachments where not uploaded anymore at all, but Windows Account wasn't locked) I rearanged some Application Pool and Site Authentication Settings to fit the development system - whichs is running without any lock problems btw. Now we have a new problem. Running MailMerge the first time, everything's working fine, Attachment is getting uploaded. Running MailMerge a seccond time, Windows Account is locked.

The Windows Users a correctly mapped to SalesLogix Users, both Accounts have the same Name, which is not a problem. I also tried same / different passwords but this is also not helping.

The process that's locking the Windows Account seems to be SData btw. through which we are uploading the Attachment from Users Client to SalesLogix Server, I think.
The Login used for SData in the javascript code of the custom MailMerge call is read out of a IAuthenticationProvider Token.

Who can help me here?