Not exists / union - two dimensions nothing in the fact folder, possible???

Question

What I am trying to do is (in functional terms) produce an invoices on hold report.
This has two distinct characteristics - some invoices are coding but on hold (easy - see first part of the SQL below), but some invoices have no coding, nothing in the FACT folder and I need to show two dimension folders which currently only join via the FACT folder - is this possible??
equivalent SQL =>
select supp.supplier_name, inv.invoice_number, inv.invoice_amount, dis.amount, code.segment1||'/||code.segment2
from     AP_INVOICES_MV inv
,          ap_suppliers_mv supp
,       ap_holds_mv hold
,      AP_INVOICE_DISTRIBUTIONS dis
,     gl_coding code
where inv.invoice_key = hold.invoice_key
and    inv.supplier_key = supp.supplier_key
and  inv.invoice_id = dis.invoice_id
and   dis.code_key = code.code_key
and   hold.holds <> 'No Holds'
union
select supp.supplier_name, inv.invoice_number, inv.invoice_amount, 0 amount, 'XXXXX/XXXX' gl_code
from     AP_INVOICES_MV inv
,          ap_suppliers_mv supp
,       ap_holds_mv hold
where inv.invoice_key = hold.invoice_key
and    inv.supplier_key = supp.supplier_key
and   hold.holds <> 'No Holds'
and   not exists
(select 'x'
from    ap_invoice_distributions dis
where dis.invoice_id = inv.invoice_id)
order by 1, 2, 4 ascMy problems are; -
1. is that the second part of the union (not exists section) requires me to join two DIMENSION tables without going via the FACT table is this possible?? (If so how - what JOINS would I need on between the FACT and the DIMENSIONS and would this significantly impede running speed generally)
2. Given that even when writing direct database requests the FROM part of the SQL is the subject area, not the tables, the tool writes the joins for you, how can I write the equivalent of the above??
n.b.
AP_INVOICES_MV - DIMENSION
ap_suppliers_mv - DIMENSION
ap_holds_mv - DIMENSION
gl_coding code - DIMENSION
AP_INVOICE_DISTRIBUTIONS FACT
With the structure following the classic STAR with all folders described in the dimensions equi joining to the FACT folder, BUT some in the invoices dimension will not have corresponding values in the FACT folder (un-coded invoices).
With thanks for your input,
Robert.

Answer 1

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