Invoice rownumbers (tdataset), where am I

Creating invoices. Would like to have a rownumber for each invoiceline (the article, quantity etc). I'm trying to use a calculated field, but how to get the rownumber? I'm using Unidac.
Paer ToernellAsked:
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Sinisa VukSoftware architectCommented:
Dataset comes with RecNo property for each row. Is this usable?
Do you create Invoices in some Reporting tool? Reports usually have function to return row number.

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Geert GOracle dbaCommented:
it depends on where you want this ... and where you want it stored
and what type of database you are using

typically it's done at insert of the record
> using a trigger with a sequence number or autonumber field

for detail records, it's not really required
it can be generated with a certain sort order

sample select with generated row numbers per invoice
  row_number() over (partition by invoice_id order by article, quantity) as detail_row, 
from invoice_details d 

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