Each Paying Agency declaring amounts can upload one XML file for "Expenditure & Adjustments", "Open Advances", and "Financial Instruments". In the XML file header, there is a mandatory field (CATS code) that identifies the Paying Agency. The uploaded data will be displayed in SFC per Paying Agency.
Afterwards, each Paying Agency must sign individually before the Coordinating Body can submit the complete Declaration containing all data from all Paying Agencies for the CAP plan. This ensures that the Paying Agency and the reported amounts can always be identified.
It is important to note that the ceiling checks and ringfencing compliance are carried out for the CAP plan as a whole, and not per region or Paying Agency.
Paying Agencies having no amounts to declare can choose between two actions. Check this FAQ.