The content of a programme can be seen by an EC user even before it is submitted to the Commission. This is to help the Member States during the amendments process.
Documents can only be consulted when they are sent. This is because documents do not have a full workflow as is the case for the structured data and their content is unknown and could contain sensible data which the Member State doesn't want the Commission to know before it is officially submitted.
Therefore, the "Other MS document" type and the "Informal Commission's Observations" document type were foreseen, so that the Member States could send whatever they want to send during the amendment process on an informal basis and the Commission could send them their observations already before the official submission.