I am proposing to introduce a single power of attorney in the sense of a power of attorney from a legal person or an entrepreneur (including lawyers) to another legal person (an accountancy service), which will apply to all existing forms and to all new forms submitted via the E-Vem system. See how E-Taxes has this set up.
We have the following problem; the client authorised us in E-Vem three years ago when there was no form for the Declarations of insurance against occupational injury and disease (M12), now the client has to go back to E-Vem to arrange a new authorisation for this form.  The second thing is to submit the authorisation in person to the e-know point. Please arrange for the power of attorney to be sent by post. E-taxes also did not have authorisation set up at the beginning of the authorisation, but then with additional authorisations for each form added, they found it time consuming and cost prohibitive to do business and changed this. Given that from 1.1.2016 onwards all health registration forms are done via e-vem, I would ask you to seriously consider changing the authorisation process.