I have seen this a couple of times and therefore wanted to mention it here briefly. When you print a report, for example a document report, the report might be printed for multiple records (documents, customers, and so on) at a time. If you see that all the headers contain the same information, it could be down to two causes.
First, you might not be using the SetData
function correctly. A different version of RDLC is used depending on the version of Dynamics NAV. In RDLC 2010, which is, at the time of writing, the latest version, if a textbox is hidden, then the expression for the value property is not executed. If that's the case then your header will be blank. If the header is not blank but always contains the same information ...
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