For example I got an error Function ‘getPricePerUnit’ does not exist or is not accessible! for object of type \OxidEsales\Eshop\Application\Model\Article
But I don’t know which function to use instead. And this is not the only case
Anton, do you know this blog post? https://oxidforge.org/en/creating-a-source-code-documentation-for-your-own-oxid-project.html
Use it in your project and find deprecated functions like shown here: https://docs.oxid-esales.com/sourcecodedocumentation/4.10.7/deprecated.html
use Google 
→ search: oxid getPricePerUnit deprecated
→ click on second result
→ since v5.0 (2012-091-4); use getFUnitPrice();
(takes less than 1 minute )
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Yes, you’re right. I was inattentive when searched it, sorry)