I've created an approval workflow with SharePoint designer 2010.
I've also modified the task form in InfoPath 2010. When a document is uploaded, the approver gets a mail, goes to the task form and selects the project from a lookup list that he thinks is matched with the document and he approves.. Everything goes just fine!!
BUT, when there are 2 approvers, it fails.. The first approver gets the mail, goes to the task form, selects a project, clicks approve .. after 20sec he returns to the site and the task is still in the 'not started' phase..
In ULS log viewer I get 'Unable to serialize workflow'.
I know this has something to do with string/integer/lookup values not matching etc, but that's not the case since it works perfect with 1 approver? Can I see 'why' he cannot serialize the worklow? Which variable causes the problem?