Thanks for your answers.
Is there anything which states (for example regulations, employment contract, etc. etc.), that a lack of proficiency may result in the termination of the employment ?
Because the only thing I know is that for losing a job there must be something very bad, like an incident, or not applying the SOPs, etc. etc.
In the case of an OPC there must be some extra training, unless somebody fails 10 times in a row ....
What do you think about it ?