This module works with openerp / odoo rel.10.
It creates an excel sheet with a cashflow, that is a forecast of the income and outcome of money in a time period.
It takes into account:
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sale and purchase invoices each with its payments terms (delays and installments)
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sale and purchase orders, provided the user fills information about the dates when he thinks that will issue or receive invoces; for purchase orders the default is to receive invoices when the goods are expected to arrive
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moves of accounts selected in the module configuration section
Limitations:
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all incomes and outcomes are put together (no distinction between bank accounts or cash, etc.)
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expected tax payments (included VAT) are not computed
Note: this module is working and has been used in practice, but should not however be considered as a fully finished product. This includes translations: many comments and some terms may be only in Italian!
Please look at it as a starting point and taylor it to your needs.