Odoo and cash register systems
There are cash register modules for Odoo, but these are no longer usable from 2020 (2022 at the latest)!
Important information about the "Law for Protection against Manipulation of Basic Digital Records"
From 2020, POS systems in Germany must have a technical security device certified by the BSI, which is intended to prevent manipulation of the recorded data by logging all digital data. This security device consists of the following 3 components:
The certification obligation does not refer to the cash registers themselves, but is limited to the technical safety equipment with which the records are to be secured.
Retailers must ensure that their POS system can be upgraded accordingly. Otherwise, a POS system that cannot be retrofitted or updated may only be used until 31 December 2022. This transitional period shall also apply to POS systems purchased after 25 November 2010 which comply with the requirements for POS systems applicable as from 1 January 2017 but which cannot be retrofitted with a security device.
The taxpayer has to communicate the following information to the tax offices responsible according to §§ 18 to 20 AO (§ 146a Abs. 4 AO):
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Name and tax number
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Type of certified technical safety device
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The type of electronic recording system used
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The number, serial numbers and acquisition dates of the electronic recording systems used
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Date of decommissioning of the electronic recording system used.
This information shall be provided on an officially prescribed form within one month of the date of acquisition or decommissioning of the electronic recording system. For cash registers already in use at the beginning of 2020, there will be a late registration period until 31 January 2020. The information serves the tax authorities, among other things, in the risk-oriented case selection for external audits (see BT-Drs. 18/10667, p. 29).
(All information to the best of our knowledge, but without guarantee for completeness and correctness).

In the future we are counting on a cooperation with FLOUR
Since it would be illusory for Odoo to get this certification, we prefer to partner with an established and modern solution that focuses on usability and usability.
We are currently planning to create an interface to FLOUR in order to offer you a good overall solution.