Report grouping question

Hello,

I need to create a report with several groupings in a Classic Client (NAV 2009).

The structure could is as follows:

‘Sales Invoice Header’

                ‘Table with Receipts’ (Link via [Invoice No_]; The [Receipt No_] is not unique and can be repeated several times in the table so I’d need to group it)

                                ‘Transaction Header’  (Linked via [Receipt No_])

                                                ‘Trans. Sales Entry’ (Linked via [Transaction No_])

                                                ‘Trans. Payment’ (Linked via [Transaction No_])

                                                ‘Trans. Income/Expense’ (Linked via [Transaction No_])

It’s also possible to skip ‘Transaction Header’  and link the three with the same indention tables via [Receipt No_].

I tried to create the report with a Report Designer only using the Data Items with properties DataItemLink, TotalFields, GroupTotalFields, and adding a Key into a table. I could handle with a first indentation but further indented tables are giving me duplication. So, I’d probably need to use a temporary table variable  ‘I’ to group firstly then to link further indented table with details. Please, advise how could I resolve it or from where I could start.

Thanks