Topic: Modifications how to?

I would like to do some modifications / addons to fa.
Is there a general description of the procedure?
Her two examples:
1. Customers should have some additional fields.
2. Articles dto. plus an alternative articlenumber, which will come up in special situations while creating invoices...

Is there a way to add fields in the database and code without having to reinstall these modifications after updating to the next fa version?

barney

Re: Modifications how to?

The only way to avoid this is to use modules/extension where you do the addon fields by adding new tables with the missing fields.

/Joe

Re: Modifications how to?

So, do I have to change the core code for 'add and manage customers'  or should I write an extension module, which completely replaces the original code???

barney