Programming Microsoft Dynamics NAV - Fifth Edition

Report data flow

One of the principal advantages of the NAV report is its built-in data flow structure. At the beginning of any report, we will define the DataItems (the tables) that the report will process. We can create a processing-only report that has no data items (if no looping through database data is required), but that situation often calls for a code unit to be used. In a report, NAV automatically creates a data flow process for each DataItem or table reference. This automatically created data flow provides specific triggers and processing events for each data item, as follows:

• Preceding the DataItem
• After reading each record of the DataItem
• Following the end of the DataItem

The underlying black-box report logic (the part we can't ...