Marco,

> What is your aproach when you have about 50 tables and related
> lookups? Do you use one main datamodule with the connection and other
> datamodules divided in "area of interest" (i.e. base tables,
> accounting ones, invoices, customers related, report tables, etc.)?

I separate concerns in different classes.
This applies to data modules as well; my typical data module holds no
more that 5-10 datasets.
Ciao
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