An e-prescription connects two activities that are crucial for a patient: (i) the activity of a physician, who provides a service, and (ii) the activity of a pharmacy, which provides a product. The patient obtains a prescription from a physician and takes it to a pharmacy to be filled. This does not work if a pharmacy does not accept the prescription. 

The amendment of 2020 to the Pharmacopeia, which entered into force in February 2021, stated that the digital or electronic signature in a prescription was subject to the following two limitations: (i) it had to comply with the Technical Standard NOM-151-SCF1-2016 over the Preservation of Data Messages and Digitization of Documents ("NOM 151") and (ii) it would only apply to one group of medicines of those referred to in Article 226 of the General Health Law (GHL). What do those two limitations mean?